| Description | Date | Identifier | |
| The failure of K.L.G. spark plugs and the recommendation to standardize Lodge A.5B plugs for Kestrel engines. | 19th May 1936 | Box 58 \ 2 Scan342 | |
| Ignition plug issues and alternatives for 'Kestrel' engines in service. | 25th May 1936 | Box 58 \ 2 Scan343 | |
| Letter replying to correspondence regarding issues with faulty V7/3B sparking plugs and their replacement. | 21th May 1936 | Box 58 \ 2 Scan344 | |
| Issues with Kestrel Engine sparking plugs and an agreement with K.L.G. for replacements. | 26th May 1936 | Box 58 \ 2 Scan345 | |
| Fulfillment of an order for spark plug servicing at Hucknall. | 28th May 1936 | Box 58 \ 2 Scan346 | |
| Letter from The Robinhood Engineering Works regarding the testing of different types of K.L.G. Sparking Plugs. | 23th Nov 1915 | Box 58 \ 3 Scan001 | |
| To the Experimental Department requesting an opinion on plugs received from The Robinhood Engineering Works. | 13th Jan 1919 | Box 58 \ 3 Scan002 | |
| To Mr. Hives regarding a parcel of K.L.G. plugs left by Smith from Martinsydes. | 19th Mar 1919 | Box 58 \ 3 Scan003 | |
| Recommending K.L.G. sparking plugs for a chassis, detailing a new cleaning tool and spring wire terminals. | 14th May 1919 | Box 58 \ 3 Scan004 | |
| Letter from The Robinhood Engineering Works regarding a new special cleaner for their 'R' type sparking plugs. | 9th May 1919 | Box 58 \ 3 Scan005 | |
| Letter to The Robinhood Engineering Works Ltd. regarding the supply and cost of cleaners for 'R' type K.L.G. spark plugs. | 14th May 1919 | Box 58 \ 3 Scan006 | |
| Letter from The Robinhood Engineering Works Ltd. regarding the supply and pricing of plug cleaners and R.4 type plugs. | 16th May 1919 | Box 58 \ 3 Scan007 | |
| Recommending the supply of a special cleaner with K.L.G. M4 type spark plugs. | 23th Sep 1919 | Box 58 \ 3 Scan008 | |
| Agreeing to supply spark plug cleaners with car tool kits and recommending they be labelled with instructions. | 24th Sep 1919 | Box 58 \ 3 Scan009 | |
| Procurement and distribution of a special sheet metal cleaner for K.L.G. R.4. plugs. | 25th Sep 1919 | Box 58 \ 3 Scan010 | |
| Letter to The Robinhood Engineering Works Ltd. regarding issues with sooted K.L.G. R4 sparking plugs. | 11th Oct 1919 | Box 58 \ 3 Scan011 | |
| To Mr. Hives regarding an order for K.L.G. chassis sparking plugs. | 15th Oct 1919 | Box 58 \ 3 Scan012 | |
| Confirming the fitting of K.L.G. spark plugs as standard for cars at the Olympia Show. | 16th Oct 1919 | Box 58 \ 3 Scan013 | |
| Test report on the compression pressure performance of various spark plugs after a 20-mile run. | 28th May 1919 | Box 58 \ 3 Scan014 | |
| Letter from Robinhood Engineering Works regarding issues with R4 type sparking plugs and the dispatch of new samples. | 17th Oct 1919 | Box 58 \ 3 Scan015 | |
| Letter from The Robinhood Engineering Works Ltd. discussing a plug with a longer insulating surface and proposing a new type of cleaner. | 17th Oct 1919 | Box 58 \ 3 Scan016 | |
| Confirming the stock level of K.L.G. sparking plugs and their usage for chassis erection. | 21th Oct 1919 | Box 58 \ 3 Scan017 | |
| Unreliability and wastefulness of K.L.G. sparking plugs after testing on car No. 64-LB. | 23th Oct 1919 | Box 58 \ 3 Scan018 | |
| The testing and comparison of K.L.G. sparking plugs. | 23th Oct 1919 | Box 58 \ 3 Scan019 | |
| Requesting the testing of 11 failed K.L.G. spark plugs from the London Repair Depot. | 29th Oct 1919 | Box 58 \ 3 Scan020 | |
| Unsatisfactory spark plug and a request to test alternative K.L.G. models. | 30th Oct 1919 | Box 58 \ 3 Scan021 | |
| Dispatch of K.L.G. Plug Cleaners and an accompanying letter. | 4th Nov 1919 | Box 58 \ 3 Scan022 | |
| Letter from The Robinhood Engineering Works regarding experimental single-point and three-point plugs and their cleaners. | 30th Oct 1919 | Box 58 \ 3 Scan023 | |
| Letter regarding the dispatch of No: 106 experimental spark plugs for testing. | 5th Nov 1919 | Box 58 \ 3 Scan024 | |
| Ignition experiments and issues with K.L.G. spark plugs sooting up. | 12th Nov 1919 | Box 58 \ 3 Scan025 | |
| 1000-mile test of Lodge porcelain sparking plugs and subsequent modifications by K.L.G. | 13th Nov 1919 | Box 58 \ 3 Scan026 | |
| Letter providing feedback on the testing of spark plugs Nos. 105-106 sent by The Robinhood Engineering Works. | 13th Nov 1919 | Box 58 \ 3 Scan027 | |
| Recommending the use of Lodge C9 spark plugs over K.L.G. plugs based on recent testing. | 13th Nov 1919 | Box 58 \ 3 Scan028 | |
| Letter from The Robinhood Engineering Works regarding tests on experimental sparking plugs. | 14th Nov 1919 | Box 58 \ 3 Scan029 | |
| Report comparing the performance of Lodge and K.L.G. ignition plugs, with a request to standardise the Lodge plugs. | 14th Nov 1919 | Box 58 \ 3 Scan030 | |
| General information memo on battery ignition issues, focusing on spark plug sooting and high-tension wiring. | 20th Nov 1919 | Box 58 \ 3 Scan031 | |
| Return and repayment of KLG 18 m/m 3 point R4 type sparking plugs. | 12th Dec 1919 | Box 58 \ 3 Scan032 | |
| Attaching correspondence with The Robinhood Engineering Works regarding KLG 18mm 3 point R4 type sparking plugs. | 9th Dec 1919 | Box 58 \ 3 Scan033 | |
| Letter from The Robinhood Engineering Works regarding the repair and supply of experimental spark plugs. | 15th Jan 1920 | Box 58 \ 3 Scan034 | |
| Continuation page of a letter from The Robinhood Engineering Works, Limited. | 15th Jan 1920 | Box 58 \ 3 Scan035 | |
| Return and replacement of faulty KLG R.4 type sparking plugs from Robinhood Engineering Works Ltd. | 16th Jan 1920 | Box 58 \ 3 Scan036 | |
| Requesting information on KLG spark plug trials to influence the policy of using Lodge C.9 plugs. | 17th Jan 1920 | Box 58 \ 3 Scan037 | |
| Extract from a report on Chassis 2EX detailing misfiring issues and performance observations. | 15th Jan 1920 | Box 58 \ 3 Scan038 | |
| Performance and suitability of Lodge and K.L.G. sparking plugs for chassis. | 20th Jan 1920 | Box 58 \ 3 Scan039 | |
| Defective KLG 18 m/m sparking plugs supplied by Robinhood Engineering Works Ltd. | 16th Mar 1920 | Box 58 \ 3 Scan040 | |
| The decision to replace defective KLG R.4 type spark plugs. | 16th Mar 1920 | Box 58 \ 3 Scan041 | |
| Letter from Robinhood Engineering Works requesting the results of tests on K.L.G. experimental spark plugs. | 20th Mar 1920 | Box 58 \ 3 Scan042 | |
| Suitability of Lodge ignition plugs with mica insulation compared to older K.L.G. and porcelain types. | 10th Sep 1920 | Box 58 \ 3 Scan043 | |
| Difficulties of cleaning spark plugs and comparing different models. | 10th Sep 1920 | Box 58 \ 3 Scan044 | |
| The 1.EX engine's poor performance at slow speeds, investigating potential ignition or valve clearance issues. | 10th Sep 1920 | Box 58 \ 3 Scan045 | |
| Letter from The Robinhood Engineering Works regarding forwarding one dozen G.1 K.L.G. sparking plugs for testing. | 13th Nov 1920 | Box 58 \ 3 Scan046 | |
| Invoice from The Robinhood Engineering Works Ltd. for 12 K.L.G. Sparking Plugs, type G-1. | 13th Nov 1920 | Box 58 \ 3 Scan047 | |
| Extract from a report on a visit to West Wittering to assess K.L.G. and Lodge spark plugs. | 30th Dec 1921 | Box 58 \ 3 Scan048 | |
| Pre-ignition trouble with K.L.G. (Type K1) sparking plugs on 40/50 HP chassis and Coshawk engines. | 19th Aug 1922 | Box 58 \ 3 Scan049 | |
| Testing of K.L.G. ignition plugs and the subsequent decision to use Lodge plugs on the 40/50 chassis. | 7th Sep 1922 | Box 58 \ 3 Scan050 | |
| Letter from The Robinhood Engineering Works regarding the supply and testing of improved K.L.G. sparking plugs. | 29th Jan 1923 | Box 58 \ 3 Scan051 | |
| Letter to Robinhood Engineering regarding issues with K.L. sparking plugs on 20 HP cars and interest in a new K-1-A type. | 30th Jan 1923 | Box 58 \ 3 Scan052 | |
| Letter from Robinhood Engineering Works regarding issues with K.L.G. sparking plugs and suggesting a new K.I.A. type. | 8th Feb 1923 | Box 58 \ 3 Scan053 | |
| Investigation into intermittent misfiring issues caused by internal leakage in 20-HP K.L.G. ignition plugs. | 14th Jan 1924 | Box 58 \ 3 Scan054 | |
| Investigation into faulty K.L.G. ignition plugs and arranging for replacement stock. | 21th Jan 1924 | Box 58 \ 3 Scan055 | |
| Complaints and failures of 20-HP K.L.G. ignition plugs. | 31th Jan 1924 | Box 58 \ 3 Scan056 | |
| The replacement or credit for plugs taken by a Mr. Van Raalte. | 31th Jan 1924 | Box 58 \ 3 Scan057 | |
| Supply and testing of 20-HP K.L.G. ignition plugs. | 25th Feb 1924 | Box 58 \ 3 Scan058 | |
| Letter from The Robinhood Engineering Works regarding the supply and replacement of K.L. sparking plugs. | 21th Feb 1924 | Box 58 \ 3 Scan059 | |
| Complaints and investigation into faulty 20-HP K.L.G. ignition plugs. | 4th Jan 1924 | Box 58 \ 3 Scan060 | |
| Correspondence regarding an issue with K.L.G. ignition plugs on a 20-HP car, which was resolved by switching to Lodge plugs. | 24th Jan 1924 | Box 58 \ 3 Scan061 | |
| Letter quoting a response from Robinhood Engineering Works regarding faulty K.L.G. ignition plugs on a 20 HP engine. | 29th Jan 1924 | Box 58 \ 3 Scan062 | |
| Letter detailing customer complaints and failures related to 20-HP K.L.G. ignition plugs. | 31th Jan 1924 | Box 58 \ 3 Scan063 | |
| Page 2 of a memo requesting replacement or credit for plugs taken by Mr. Van Raalte. | 31th Jan 1924 | Box 58 \ 3 Scan064 | |
| Issues and proposed improvements for the 20-HP K.L.G. ignition plugs. | 13th Feb 1924 | Box 58 \ 3 Scan065 | |
| Improved 'stepping' plug design to prevent oiling up. | 13th Feb 1924 | Box 58 \ 3 Scan066 | |
| Customer complaints of faulty K.L.G. ignition plugs and arranging for the return and replacement. | 5th Mar 1924 | Box 58 \ 3 Scan067 | |
| Letter regarding KLG ignition plugs and a proposal from Robinhood Engineering Works to experiment with an ignition coil on the 20 HP Chassis. | 6th Mar 1924 | Box 58 \ 3 Scan068 | |
| Letter regarding a delay in the supply of K.L.G. K.1 sparking plugs for the 20 HP Chassis from Robinhood Engineering Works. | 7th Mar 1924 | Box 58 \ 3 Scan069 | |
| The appropriate ignition coils for testing K.L.G. ignition plugs on a 20-HP chassis. | 7th Mar 1924 | Box 58 \ 3 Scan070 | |
| K.L.G. Ignition Plugs for a 20 HP Chassis and the loan of a trembler coil to Robinhood Engineering for testing. | 17th Mar 1924 | Box 58 \ 3 Scan071 | |
| Supply and renovation of K.L.G. ignition plugs for the 20 HP Chassis. | 31th Mar 1924 | Box 58 \ 3 Scan072 | |
| Letter from Robinhood Engineering Works concerning modifications to sparking plugs to prevent sparking down the external mica sleeve. | 27th Mar 1924 | Box 58 \ 3 Scan073 | |
| Letter from The Robinhood Engineering Works, Limited regarding a delay. | 27th Mar 1924 | Box 58 \ 3 Scan074 | |
| Urgent memo regarding stock levels of 20HP sparking plugs and the performance of improved K.L.G. plugs. | 8th Apr 1924 | Box 58 \ 3 Scan075 | |
| The testing of 20-HP K.L.G. sparking plugs. | 9th Apr 1924 | Box 58 \ 3 Scan076 | |
| Extended testing and standardization of new K.L.G. sparking plugs for the 20 HP chassis. | 15th May 1924 | Box 58 \ 3 Scan077 | |
| The distribution of 20-HP chassis sparking plugs for testing and standardisation. | 19th May 1924 | Box 58 \ 3 Scan078 | |
| Decision not to proceed with K.I.R. ignition plugs as standard for the 20 HP Chassis. | 19th Jun 1924 | Box 58 \ 3 Scan079 | |
| Mix-up with an order of 1500 K.L.G. sparking plugs for 20 HP models. | 19th May 1924 | Box 58 \ 3 Scan080 | |
| Standardisation report for a modified K.L.G. sparking plug design to improve insulation. | 20th May 1924 | Box 58 \ 3 Scan081 | |
| Performance and standardization of various sparking plugs. | 17th Jul 1924 | Box 58 \ 3 Scan082 | |
| To the Order Office requesting a change in ignition plug specification for the 20 HP chassis. | 2nd Oct 1924 | Box 58 \ 3 Scan083 | |
| The arrival of twelve Lodge 275 plugs and requesting comments. | 17th Nov 1926 | Box 58 \ 3 Scan084 | |
| Letter acknowledging an order for K.L.G. plugs (type 201) and suggesting an improved alternative (type 275). | 12th Nov 1924 | Box 58 \ 3 Scan085 | |
| Recommendation to obtain Champion Sparking Plugs for 20 HP & 40/50 HP chassis testing. | 19th Nov 1924 | Box 58 \ 3 Scan086 | |
| Sending a set of 12 K.L.G plugs to the Argentine for the Prince of Wales' Chassis No. 20.MC. | 12th Jun 1925 | Box 58 \ 3 Scan087 | |
| Letter from Robinhood Engineering Works regarding pricing and trade discounts for K.L.G. plugs. | 27th Jun 1925 | Box 58 \ 3 Scan088 | |
| Alphabetical list of K.L.G. sparking plugs recommended for various makes of engines, including cars, motorcycles, and commercial vehicles. | 27th Jun 1925 | Box 58 \ 3 Scan089 | |
| Product information sheet for KLG sparking plugs for motor cars, motor cycles, and marine engines. | 30th Jun 1925 | Box 58 \ 3 Scan090 | |
| Issues with the carburettors and ignition plugs on a New Phantom vehicle. | 30th Jun 1925 | Box 58 \ 3 Scan091 | |
| Suitability of K.L.G. spark plugs for the Phantom Engine, comparing them to Lodge plugs. | 5th Mar 1927 | Box 58 \ 3 Scan092 | |
| Suitability of K.L.G. plugs for the Phantom engine, comparing them to Lodge plugs. | 5th Mar 1927 | Box 58 \ 3 Scan093 | |
| Requesting the despatch of a K.L.G. sparking plug to the manufacturer for inspection. | 14th Mar 1927 | Box 58 \ 3 Scan094 | |
| Agreement to fit K.L.G. sparking plugs to the next series of 50 40/50 HP cars. | 19th Mar 1927 | Box 58 \ 3 Scan095 | |
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