| Description | Date | Identifier | |
| Requesting an order for two Ferranti car radio sets. | 18th Nov 1938 | Box 168b \ 1 img125 | |
| Letter to Park Ward Co. Ltd. regarding the dispatch of a Ferranti wireless set and controls. | 19th Nov 1938 | Box 168b \ 1 img126 | |
| Letter from Ferranti Ltd. regarding an order for two Car Radio Units and two Running Board Aerials. | 29th Nov 1938 | Box 168b \ 1 img127 | |
| Acceptance of order from Ferranti Ltd. for two car radio units and two running board aerials. | 28th Nov 1938 | Box 168b \ 1 img128 | |
| Letter to Ferranti Ltd. requesting modifications for radio sets and inquiring about a tone control feature. | 3rd Dec 1938 | Box 168b \ 1 img129 | |
| Letter from Ferranti Ltd regarding the dispatch of car radio sets, new dials, and related components. | 5th Dec 1938 | Box 168b \ 1 img130 | |
| Letter from Ferranti Ltd concerning a request for extra long pilot lamp leads and Bowden cables for car radio controls. | 6th Dec 1938 | Box 168b \ 1 img131 | |
| Request to manufacture a metal container for a radio set, to be fitted under the driver's seat. | 7th Dec 1938 | Box 168b \ 1 img132 | |
| The interchanged positions of the heater and Philco radio set. | 9th Dec 1938 | Box 168b \ 1 img133 | |
| Letter from Ferranti Ltd. regarding a delay in despatching non-standard length control cables. | 16th Dec 1938 | Box 168b \ 1 img134 | |
| Schemes for a pressed steel Bentley dashboard, including silent bloc mounting and alterations. | 19th Dec 1938 | Box 168b \ 1 img135 | |
| Request to return a faulty Philco Radio set for overhaul and repair. | 20th Dec 1938 | Box 168b \ 1 img136 | |
| Request to obtain a 'Radio Nine' car radio set from Mastoradio Ltd. on a sale or return basis. | 21th Dec 1938 | Box 168b \ 1 img137 | |
| Requesting a covering order to Messrs. Ferranti Ltd. for radio control parts for vehicle 25.G.VI. | 22th Dec 1938 | Box 168b \ 1 img138 | |
| Letter from Erie Resistor Limited regarding suppressors for eliminating car radio ignition interference. | 30th Dec 1938 | Box 168b \ 1 img139 | |
| Letter from Erie Resistor Limited promoting their moulded carbon resistance suppressors. | 30th Dec 1938 | Box 168b \ 1 img140 | |
| Promotional leaflet for Erie Suppressors to eliminate ignition interference on radio equipped automobiles. | 30th Dec 1938 | Box 168b \ 1 img141 | |
| Catalogue page illustrating various types of Erie suppressors for spark plugs and distributors. | 30th Dec 1938 | Box 168b \ 1 img142 | |
| The function, efficiency, and life of Erie Suppressors for eliminating ignition interference in automobiles. | 30th Dec 1938 | Box 168b \ 1 img143 | |
| Product information sheet for Erie Suppressors and Erie Resistors, detailing performance tests, mechanical features, and company details. | 11th Jan 1938 | Box 168b \ 1 img144 | |
| Letter to Erie Resistor Ltd. arranging a meeting to discuss suppressors problems. | 11th Jan 1938 | Box 168b \ 1 img145 | |
| Confirming receipt of a running board aerial from Masteradio Ltd as part of an order. | 13th Jan 1939 | Box 168b \ 1 img146 | |
| Letter from Masteradio Ltd. cancelling instructions for a nine-valve radio set and substituting it with a seven-valve set. | 13th Jan 1939 | Box 168b \ 1 img147 | |
| Letter from Erie Resistor Limited confirming a telegram to rearrange an appointment due to a postal delay. | 16th Jan 1939 | Box 168b \ 1 img148 | |
| Letter from Erie Resistor Limited confirming a meeting arrangement for their Chief Engineer to visit. | 18th Jan 1939 | Box 168b \ 1 img149 | |
| Request to issue a covering order to Messrs. Ferranti Ltd. for various leads for a Ferranti set on WXA.2. | 18th Jan 1939 | Box 168b \ 1 img150 | |
| Letter from Erie Resistor Limited confirming a wired message about an arrival time. | 19th Jan 1939 | Box 168b \ 1 img151 | |
| Short handwritten note promising the arrival of something at Lillie Hall on a Monday. | 20th Jan 1939 | Box 168b \ 1 img152 | |
| Upcoming legislation on the suppression of radio interference from motor cars. | 20th Jan 1939 | Box 168b \ 1 img153 | |
| Request to manufacture one dozen aluminium distance pieces for mounting radio sets on the dashboard. | 28th Jan 1939 | Box 168b \ 1 img154 | |
| Minutes of a meeting regarding the inspection and specification of B.5. Standard Bodies and lamp designs. | 31th Jan 1939 | Box 168b \ 1 img155 | |
| Meeting notes discussing design choices for car body components including doors, floors, roof, and ventilation. | 31th Jan 1939 | Box 168b \ 1 img156 | |
| Meeting notes discussing the design of an instrument board, wind noise, heating, sound insulation, and radio. | 31th Jan 1939 | Box 168b \ 1 img157 | |
| The design considerations for petrol fillers, waist moulding, and bumpers. | 31th Jan 1939 | Box 168b \ 1 img158 | |
| Letter from Erie Resistor Limited following up on a meeting regarding interference suppressors and air-screw performance investigation. | 31th Jan 1939 | Box 168b \ 1 img159 | |
| Request to obtain a dozen 'J' type suppressors from Erie Resistor Ltd. | 10th Feb 1939 | Box 168b \ 1 img160 | |
| Letter to Erie Resistor Ltd. regarding an order for suppressors and expressing interest in their strain element. | 11th Feb 1939 | Box 168b \ 1 img161 | |
| Letter to Ferranti Ltd. providing feedback on a tested set, criticising its heavy mounting plates and suggesting a lighter single-plate design. | 11th Feb 1939 | Box 168b \ 1 img162 | |
| Letter from Ferranti Ltd regarding product feedback and the development of a new, smaller, one-piece unit. | 14th Feb 1939 | Box 168b \ 1 img163 | |
| Letter from Erie Resistor Limited enclosing a sample strain element for examination. | 14th Feb 1939 | Box 168b \ 1 img164 | |
| Letter from Erie Resistor Limited concerning suppressors and Erie strain elements. | 13th Feb 1939 | Box 168b \ 1 img165 | |
| Letter discussing the application and supply of strain elements for mechanical measurements and testing. | 13th Feb 1939 | Box 168b \ 1 img166 | |
| Letter from Erie Resistor Limited regarding strain elements and a suppressor order. | 13th Feb 1939 | Box 168b \ 1 img167 | |
| Extract from a report on the characteristics and calibration of carbon-resistance and 'Ess-strip' strain pick-ups. | 13th Feb 1939 | Box 168b \ 1 img168 | |
| The calibration of 'Ess-strip' strain gages and the design of a dynamic calibrator. | 17th Feb 1939 | Box 168b \ 1 img169 | |
| Letter to Erie Resistor Ltd. acknowledging receipt of a strain element for examination and laboratory testing. | 17th Feb 1939 | Box 168b \ 1 img170 | |
| Instruction to order two ash trays to replace the Ferranti Radio Control Panel on cars Wraith 80 & 3.B.50. | 17th Feb 1939 | Box 168b \ 1 img171 | |
| Order for one ashtray similar to a previous order. | 21th Feb 1939 | Box 168b \ 1 img172 | |
| Follow-up memo regarding a decision on a Model 297 car radio supplied by Masteradio Limited. | 21th Mar 1939 | Box 168b \ 1 img173 | |
| Failure of a 'Master Seven' car radio set during a trial and requesting its return. | 21th Mar 1939 | Box 168b \ 1 img174 | |
| Experimental department report on radio interference from a car's ignition system and the effect of a suppressor. | 29th Mar 1939 | Box 168b \ 1 img175 | |
| The effect of a suppressor in the coil H.T. lead on radio interference from a car ignition system. | 29th Mar 1939 | Box 168b \ 1 img176 | |
| Page of oscillograms showing radio interference from a Buick 8 engine under various conditions. | 3rd Apr 1939 | Box 168b \ 1 img177 | |
| The status of a masteradio set returned for improvement. | 3rd Apr 1939 | Box 168b \ 1 img178 | |
| Sales letter from World Radio Limited to Bentley Motors promoting the new Motorola Model 9-49 car radio. | 24th Apr 1939 | Box 168b \ 1 img179 | |
| Letter to Bentley Motors about a patented Motorola aerial 'Booster' unit. | 24th Apr 1939 | Box 168b \ 1 img180 | |
| Request to obtain an under-running board type aerial from Ferranti Ltd. for a Bentley 10.B.V. | 29th Apr 1939 | Box 168b \ 1 img181 | |
| Letter to World Radio Ltd. declining to test their new model 9.49 radio. | 5th May 1939 | Box 168b \ 1 img182 | |
| Letter from a radio supplier regarding their new Motorola car radio model for high-speed vehicles. | 8th May 1939 | Box 168b \ 1 img183 | |
| Request for the despatch and replacement of a faulty Feranti car radio set switch unit. | 8th Jun 1939 | Box 168b \ 1 img184 | |
| Letter to Ferranti Ltd. about a failed 128C type car radio, requesting a replacement and providing feedback on tone control. | 8th Jun 1939 | Box 168b \ 1 img185 | |
| Letter from Ferranti Ltd concerning a faulty car radio switch and the development of new models. | 9th Jun 1939 | Box 168b \ 1 img186 | |
| Closing page of a letter from the Car Radio Sales & Production Manager at Ferranti Ltd. | 14th Jun 1939 | Box 168b \ 1 img187 | |
| Letter from Masteradio Ltd. regarding the testing of two car radio sets and offering a new model for testing. | 14th Jun 1939 | Box 168b \ 1 img188 | |
| Letter to Ferranti Ltd. regarding the testing of a new switch and a single unit set with variable tone control. | 15th Jun 1939 | Box 168b \ 1 img189 | |
| Letter to Master Radio Ltd. providing feedback on the testing of two radio models. | 22th Jun 1939 | Box 168b \ 1 img190 | |
| Trial, purchase, and return of Masteradio car radio sets. | 22th Jun 1939 | Box 168b \ 1 img191 | |
| Letter from Masteradio Ltd. concerning the performance and interference issues of car radios, models 101 and 297. | 24th Jun 1939 | Box 168b \ 1 img192 | |
| Letter from MASTERADIO LTD. regarding a new control head and wave change switch. | 24th Jun 1939 | Box 168b \ 1 img193 | |
| Requesting the removal of a radio set from car 1.B.50 as the wireless licence has expired. | 6th Jul 1999 | Box 168b \ 1 img194 | |
| Letter to Masteradio Ltd. regarding the testing of a new eight-valve radio set in an experimental car. | 10th Jul 1939 | Box 168b \ 1 img195 | |
| Letter from Masteradio Ltd. regarding the testing of a new eight-valve set and the return of a Model 101 receiver. | 11th Jul 1939 | Box 168b \ 1 img196 | |
| Letter to Masteradio Ltd. concerning the delayed despatch of a Model 101 receiver. | 13th Jul 1939 | Box 168b \ 1 img197 | |
| Comparison between American and British car radio sets, establishing the criteria for an ideal car radio. | 13th Jul 1939 | Box 168b \ 1 img198 | |
| List of seven key requirements for the design and function of a car radio. | 13th Jul 1939 | Box 168b \ 1 img199 | |
| Comparison of the American and British car radio industries, highlighting American superiority. | 13th Jul 1939 | Box 168b \ 1 img200 | |
| The development of British car radios and the need for manufacturers to adapt designs for installation. | 14th Jul 1939 | Box 168b \ 1 img201 | |
| Comparison of car radio servicing facilities and popularity in the UK versus America. | 14th Jul 1939 | Box 168b \ 1 img202 | |
| Request to obtain a car radio set and aerial from World Radio Ltd. on a sale or return basis. | 17th Jul 1939 | Box 168b \ 1 img203 | |
| Letter to World Radio Ltd. about testing a radio set and challenges with fitting an aerial to a Bentley. | 17th Jul 1939 | Box 168b \ 1 img204 | |
| Letter from World Radio Limited regarding the despatch of a Motorola car radio and aerial. | 18th Jul 1939 | Box 168b \ 1 img205 | |
| Letter to World Radio Ltd. concerning a Motorola radio set installation and aerial samples. | 20th Jul 1939 | Box 168b \ 1 img206 | |
| Letter from World Radio Limited (Motorola) regarding the dispatch of sample car radio aerials. | 22th Jul 1939 | Box 168b \ 1 img207 | |
| Letter from Masteradio Ltd. proposing the design of a bespoke car radio receiver. | 27th Jul 1939 | Box 168b \ 1 img208 | |
| Letter from Masteradio Ltd. arranging a follow-up visit regarding a car radio. | 2nd Aug 1939 | Box 168b \ 1 img209 | |
| Heavily faded cover sheet with handwritten notes, an inverted address stamp, and an embossed 'DISCARDED' mark. | 8th Aug 1939 | Box 168b \ 1 img210 | |
| Letter from the Experimental Department to World Radio Ltd. regarding the receipt of aerials and a set for testing. | 8th Aug 1939 | Box 168b \ 1 img211 | |
| Letter to Masteradio Ltd. regarding a missed meeting to discuss radio sets and rescheduling for the Radio Olympia event. | 9th Aug 1939 | Box 168b \ 1 img212 | |
| Letter from World Radio Limited regarding the installation of car radios and aerials. | 10th Aug 1939 | Box 168b \ 1 img213 | |
| Letter from Masteradio Ltd. arranging a meeting at the Radio Show to discuss car radios. | 10th Aug 1939 | Box 168b \ 1 img214 | |
| Letter to Ferranti Ltd. regarding the progress of a new radio set and seeking advice on installing a concealed roof aerial. | 11th Aug 1939 | Box 168b \ 1 img215 | |
| Letter from Ferranti Ltd. regarding a single-unit car radio set and an invitation to the Olympia Radio Exhibition. | 16th Aug 1939 | Box 168b \ 1 img216 | |
| The radio set and aerial for chassis 33.G.VII, requesting their despatch to body builders for fitment. | 17th Aug 1939 | Box 168b \ 1 img217 | |
| Listing cars that have radio sets installed for wireless license purposes. | 22th Aug 1939 | Box 168b \ 1 img218 | |
| Letter to Masteradio Ltd. arranging a visit from an engineer. | 23th Aug 1937 | Box 168b \ 1 img219 | |
| Letter to Ferranti Ltd. confirming an engineer's visit to a show. | 23th Aug 1939 | Box 168b \ 1 img220 | |
| Letter from Masteradio Ltd. arranging a meeting with a Mr. Child at the Radiolympia show. | 24th Aug 1939 | Box 168b \ 1 img221 | |
| Two invoices received from World Radio Ltd. and instructions for their clearance. | 22th Aug 1939 | Box 168b \ 1 img222 | |
| Invoice from World Radio Limited for a Motorola car radio set, aerial, and controls. | 26th Jul 1939 | Box 168b \ 1 img223 | |
| Copy of a dispatch note from World Radio Limited for a roof aerial and a side telescopic aerial. | 22th Jul 1939 | Box 168b \ 1 img224 | |
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