| Description | Date | Identifier | |
| Translated letter from Maybach-Motorenbau regarding licensing terms for an overspeed transmission. | 14th Apr 1931 | Box 128 \ 2 scan0080 | |
| Modifications and operational issues with an epicyclic 3rd speed gearbox and Maybach clutch. | 17th Apr 1931 | Box 128 \ 2 scan0081 | |
| Return of drawings and quotations from the Maybach Co. | 20th Apr 1931 | Box 128 \ 2 scan0082 | |
| Proposal from the UK agent for Maybach to fit their transmission to a new smaller car model. | 28th Jan 1932 | Box 128 \ 2 scan0083 | |
| Letter discussing the benefits and adoption of the Maybach overspeed gearbox. | 1st Nov 1931 | Box 128 \ 2 scan0084 | |
| Brochure detailing the features and operation of the New Maybach Transmission. | 1st Nov 1931 | Box 128 \ 2 scan0085 | |
| The features, specifications, and advantages of the New Maybach Transmission. | 5th Mar 1931 | Box 128 \ 2 scan0086 | |
| Quotation letter from Maybach-Motorenbau for a DSG 80 gearbox. | 5th Mar 1931 | Box 128 \ 2 scan0087 | |
| Quotation from Maybach-Motorenbau for gearbox vacuum control parts. | 5th Mar 1931 | Box 128 \ 2 scan0088 | |
| Quotation from Maybach-Motorenbau for a DSG 80 gearbox. | 5th Mar 1931 | Box 128 \ 2 scan0089 | |
| Quote from Maybach-Motorenbau for a steering wheel gear lever insert and parts for a vacuum shifting mechanism. | 5th Mar 1931 | Box 128 \ 2 scan0090 | |
| General delivery and warranty conditions for Maybach-Motorenbau G.m.b.H. of Friedrichshafen. | 5th Mar 1931 | Box 128 \ 2 scan0091 | |
| Page of German terms and conditions from Maybach-Motorenbau concerning sales and warranty. | 5th Mar 1931 | Box 128 \ 2 scan0092 | |
| Blank Maybach-Motorenbau G.m.b.H. vehicle specification and gearbox questionnaire. | 5th Mar 1931 | Box 128 \ 2 scan0093 | |
| Blank Maybach-Motorenbau G.m.b.H. vehicle specification questionnaire for a gearbox proposition. | 5th Mar 1931 | Box 128 \ 2 scan0094 | |
| Blank German language form from Maybach-Motorenbau G.m.b.H. for detailing vehicle engine installation specifications. | 5th Mar 1931 | Box 128 \ 2 scan0095 | |
| Maybach-Motorenbau G.m.b.H. form for vehicle installation specifications. | 26th Oct 1938 | Box 128 \ 2 scan0096 | |
| Installation sketch for the DJG 80 gearbox for block connection to the DSO motor. | 26th Oct 1938 | Box 128 \ 2 scan0097 | |
| Installation sketch for the 'DSG 80' transmission model for separate mounting in a frame. | 22th Dec 1930 | Box 128 \ 2 scan0098 | |
| Patent royalties for Maybach and comparing them with Ricardo's pricing for a combustion chamber. | 14th Apr 1931 | Box 128 \ 2 scan0099 | |
| Cost and feasibility of using the Maybach Patents 'Double Top' system. | 21th Apr 1931 | Box 128 \ 2 scan0100 | |
| High royalty costs and technical reservations about licensing the Maybach Easy Change Gear. | 21th Apr 1931 | Box 128 \ 2 scan0101 | |
| Trial and potential acquisition of a Maybach gearbox. | 21th Apr 1931 | Box 128 \ 2 scan0102 | |
| Outlining reasons for not purchasing a Maybach gearbox and discussing alternative solutions. | 22th Apr 1931 | Box 128 \ 2 scan0103 | |
| Letter from a Maybach agent regarding a delayed gearbox demonstration and a proposed visit. | 10th Jun 1931 | Box 128 \ 2 scan0104 | |
| Letter from Ernst Schneider regarding a demonstration of the new Maybach Gearbox. | 16th Jun 1931 | Box 128 \ 2 scan0105 | |
| Letter to Ernest Scheider declining an offer to demonstrate a car due to the royalties asked for by the Maybach Co. of Berlin. | 17th Jun 1931 | Box 128 \ 2 scan0106 | |
| Letter from Associated Transmissions Limited regarding a design for Humphrey-Sandberg clutches in a silent third gearbox. | 5th Oct 1931 | Box 128 \ 2 scan0107 | |
| Letter to Associated Transmissions Ltd. declining a suggested design for a silent third gearbox using Humfrey-Sandberg clutches. | 6th Oct 1931 | Box 128 \ 2 scan0108 | |
| Covering memo attaching particulars of Borg & Beck Clutches. | 29th Jan 1932 | Box 128 \ 2 scan0109 | |
| Article from 'The Motor' magazine describing the latest Borg and Beck single-disc clutch. | 27th Jan 1931 | Box 128 \ 2 scan0110 | |
| Article detailing the construction and functioning of the new Schrader valve and a tyre-pressure gauge. | 27th Jan 1931 | Box 128 \ 2 scan0111 | |
| Letter from Borg & Beck Company Ltd. regarding data sheets, drawings, and production schedules for various clutches. | 28th Jan 1932 | Box 128 \ 2 scan0112 | |
| General description of Borg and Beck Type A-1 clutches, detailing their design, features, and specifications. | 28th Jan 1932 | Box 128 \ 2 scan0113 | |
| Informational leaflet for the Borg & Beck Single Dry Plate Clutch, Type A1, detailing available models and torque capacities. | 28th Jan 1932 | Box 128 \ 2 scan0114 | |
| Specification sheet for a Borg & Beck 7¼ RD-G unit type clutch. | 28th Jan 1932 | Box 128 \ 2 scan0115 | |
| Diagram of a Borg & Beck Type 7 1/4 RD clutch assembly. | 28th Jan 1932 | Box 128 \ 2 scan0116 | |
| Specification sheet for a British Made Borg & Beck Clutch, Type 9 A1-G (Unit Type). | 28th Jan 1932 | Box 128 \ 2 scan0117 | |
| Technical drawing of a Borg & Beck Type 9 A1 model clutch assembly with cross-section and component dimensions. | 28th Jan 1932 | Box 128 \ 2 scan0118 | |
| Specification sheet for the British Made Borg & Beck Clutch, Type 10 A1-G. | 28th Jan 1932 | Box 128 \ 2 scan0119 | |
| Technical drawing of a Borg & Beck Type 10A-1 model clutch assembly. | 28th Jan 1932 | Box 128 \ 2 scan0120 | |
| Specification sheet for the Borg & Beck Type 11 A1 clutch. | 28th Jan 1932 | Box 128 \ 2 scan0121 | |
| Schematic diagram of a clutch assembly, including top-down and cross-section views. | 28th Jan 1932 | Box 128 \ 2 scan0122 | |
| Specification sheet for the British-made Borg & Beck Type 13R (Open Type) clutch. | 28th Jan 1932 | Box 128 \ 2 scan0123 | |
| Schematic diagram of a Borg & Beck clutch assembly with dimensions and annotations. | 28th Jan 1932 | Box 128 \ 2 scan0124 | |
| Advertisement for Borg & Beck friction clutches, announcing their new British production in Leamington Spa. | 22th Feb 1932 | Box 128 \ 2 scan0125 | |
| Conversation with Borg & Beck about their Lockheed Hydraulic Brakes and single dry plate clutches. | 22th Feb 1932 | Box 128 \ 2 scan0126 | |
| Specification sheet for a Borg & Beck Clutch, Type 10 A1-G. | 22th Feb 1932 | Box 128 \ 2 scan0127 | |
| Plan and cross-section diagram of a Type 10 A-1 Model clutch assembly. | 22th Feb 1932 | Box 128 \ 2 scan0128 | |
| Investigation of vacuum-clutch control technology, referencing American examples. | 22th Feb 1932 | Box 128 \ 2 scan0129 | |
| Letter from Herbert Clark of Bendix-Perrot Brakes Ltd to W. A. Robotham arranging a meeting. | 6th Apr 1932 | Box 128 \ 2 scan0130 | |
| Vacuum-operated clutch on the Cadillac car and its potential trial. | 6th Apr 1932 | Box 128 \ 2 scan0131 | |
| Instructions for adjusting the clutch bleeder valve and checking for clutch slippage. | 14th Apr 1932 | Box 128 \ 2 scan0132 | |
| Letter from Bendix-Perrot Brakes Ltd. regarding a demonstration of their Clutch Control and the forwarding of Startix Units. | 14th Apr 1932 | Box 128 \ 2 scan0133 | |
| Letter from Bendix-Perrot Brakes Ltd. concerning a demonstration of the Bendix Clutch Control. | 18th Apr 1932 | Box 128 \ 2 scan0134 | |
| Letter from Herbert Clark arranging a demonstration of a Humber 'Snipe' car fitted with a Bendix Clutch Control. | 19th Apr 1932 | Box 128 \ 2 scan0135 | |
| Telegram confirmation regarding arranging a demonstration for a clutch control. | 1st Apr 1939 | Box 128 \ 2 scan0136 | |
| Telegram arranging a demonstration of a clutch control as requested by Clark Bendixcorp. | 1st Apr 1939 | Box 128 \ 2 scan0137 | |
| Telegram requesting to arrange for a Bendix director to send his car with a vacuum clutch for a short trial. | 19th Apr 1932 | Box 128 \ 2 scan0138 | |
| Telegram to Bendix-Perrot Brakes Ltd requesting a trial of a vacuum clutch car. | 19th Apr 1932 | Box 128 \ 2 scan0139 | |
| Cost of fitting vacuum clutch control pieces to a 40/50 car. | 20th Apr 1932 | Box 128 \ 2 scan0140 | |
| Letter to Bendix-Perrot Brakes Ltd thanking them for sending a car to London. | 20th Apr 1932 | Box 128 \ 2 scan0141 | |
| Letter to Bendix Brake Corporation arranging the fitting of an automatic clutch control to a 40/50 experimental car. | 23th Apr 1932 | Box 128 \ 2 scan0142 | |
| Letter to Bendix Brake Corporation regarding a delay due to vacuum clutch control trouble on a test car. | 25th Apr 1932 | Box 128 \ 2 scan0143 | |
| Letter from Bendix-Perrot Brakes Ltd. regarding the installation of a Bendix Clutch Control on an experimental car. | 25th Apr 1932 | Box 128 \ 2 scan0144 | |
| Letter to Bendix-Perrot Brakes Ltd. regarding a delayed delivery of a 40/50 HP car. | 11th May 1932 | Box 128 \ 2 scan0145 | |
| Telegram to Bendix Perrot Brakes Ltd. regarding a car being delayed. | 23th May 1932 | Box 128 \ 2 scan0146 | |
| Letter to Bendix-Perrot Brakes Ltd. urging the completion of work on a car. | 2nd Jun 1932 | Box 128 \ 2 scan0147 | |
| Letter from Bendix-Perrot Brakes Ltd. regarding the progress of a brake installation. | 3rd Jun 1932 | Box 128 \ 2 scan0148 | |
| Requesting the order and testing of a Borg & Beck clutch for the 25HP model. | 1st Jul 1932 | Box 128 \ 2 scan0149 | |
| Borg & Beck clutch on a 25HP model, discussing a new scheme and flywheel materials. | 22th Jul 1932 | Box 128 \ 2 scan0150 | |
| Letter from Bendix-Perrot Brakes Ltd. concerning the delivery of 12' brake shoes and a complete 12' brake. | 27th Jul 1932 | Box 128 \ 2 scan0151 | |
| Letter to Bendix-Perrot Brakes Ltd. regarding unsatisfactory performance of a Bendix clutch control device. | 22th Aug 1932 | Box 128 \ 2 scan0152 | |
| Letter from Bendix-Perrot Brakes Ltd. to W.A. Robotham regarding a meeting about Bendix Clutch Control. | 23th Aug 1932 | Box 128 \ 2 scan0153 | |
| Letter to Bendix-Perrot Brakes Ltd arranging a meeting to compare clutch control performance. | 24th Aug 1932 | Box 128 \ 2 scan0154 | |
| Providing comments on the design of a Donflex clutch disc, discussing springs, insulation, and dimensions. | 27th Aug 1932 | Box 128 \ 2 scan0155 | |
| Letter to Bendix-Perrot Brakes discussing clutch improvements, brake linings, and an enquiry about Standard cars. | 8th Sep 1932 | Box 128 \ 2 scan0156 | |
| Letter from Bendix-Perrot Brakes Ltd. concerning clutch modifications, brake lining material, and a car recommendation. | 9th Sep 1932 | Box 128 \ 2 scan0157 | |
| Letter from Bendix-Perrot Brakes Ltd. regarding the possibility of incorporating their brakes on cars. | 15th Sep 1932 | Box 128 \ 2 scan0158 | |
| Inquiry regarding the cost of fitting front wheel brakes and London representation. | 14th Sep 1932 | Box 128 \ 2 scan0159 | |
| Letter to Bendix-Brakes Ltd discussing carburetters, the impossibility of fitting front wheel brakes to older cars, and clutch control tests. | 17th Sep 1932 | Box 128 \ 2 scan0160 | |
| Letter from Bendix-Perrot Brakes Ltd regarding brakes, carburetors, and a test chassis. | 19th Sep 1932 | Box 128 \ 2 scan0161 | |
| Borg & Beck clutch experiment on a 25HP model, with drawings for suggested modifications. | 1st Aug 1932 | Box 128 \ 2 scan0162 | |
| Cover note attaching a copy of a letter received from Messrs. Borg & Beck Ltd. regarding their exhibits at an upcoming Motor Show. | 30th Sep 1932 | Box 128 \ 2 scan0163 | |
| Invitation from Borg & Beck Company Ltd. to visit their stand at the Motor Exhibition. | 29th Sep 1932 | Box 128 \ 2 scan0164 | |
| Letter to Bendix-Perrot Brakes Ltd. regarding unsuccessful efforts on a clutch control. | 30th Sep 1932 | Box 128 \ 2 scan0165 | |
| Test of a modified vacuum clutch control system and its comparison to the Bendix system. | 18th Oct 1932 | Box 128 \ 2 scan0166 | |
| Letter from Roper & Wreaks Ltd. promoting their 'Faultless Clutch' and offering a demonstration, referencing a positive article in 'Autocar' magazine. | 14th Nov 1932 | Box 128 \ 2 scan0167 | |
| Page from The Autocar magazine featuring articles on new automotive products, a clutch test, and general motoring news. | 11th Nov 1932 | Box 128 \ 2 scan0168 | |
| Requesting an update on the experiment testing a Borg & Beck 10.A.1.G. clutch in a 25HP model. | 2nd Dec 1932 | Box 128 \ 2 scan0169 | |
| Delay in testing a Borg & Beck 20/25 clutch. | 5th Dec 1932 | Box 128 \ 2 scan0170 | |
| Letter to Automotive Products Co. Ltd. arranging a visit to discuss a Borg & Beck clutch experiment. | 10th Dec 1932 | Box 128 \ 2 scan0171 | |
| Letter from Automotive Products Company arranging a meeting with the Experimental Department. | 13th Dec 1932 | Box 128 \ 2 scan0172 | |
| Letter to Lockheed Hydraulic Braking System confirming a visit to their works. | 15th Dec 1932 | Box 128 \ 2 scan0173 | |
| Visit to Borg & Beck Clutch Works to discuss clutch rating, performance, and design features. | 23th Dec 1932 | Box 128 \ 2 scan0174 | |
| The design and materials of a commercial vehicle clutch, including details on friction fabric and spring construction. | 21th Dec 1932 | Box 128 \ 2 scan0175 | |
| Letter from clutch manufacturer Borg & Beck Company Ltd. regarding a forwarded order and arranging a meeting. | 31th Dec 1932 | Box 128 \ 2 scan0176 | |
| Letter to Messrs. Borg & Beck Co. Ltd. arranging a meeting with their representative. | 2nd Jan 1933 | Box 128 \ 2 scan0177 | |
| Letter from clutch manufacturer Borg & Beck Company Ltd. arranging a meeting to discuss clutch requirements. | 3rd Jan 1933 | Box 128 \ 2 scan0178 | |
| Patent enquiry to Messrs Borg & Beck Co. Ltd regarding torsionally flexible clutch driven members. | 12th Jan 1933 | Box 128 \ 2 scan0179 | |
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