| Description | Date | Identifier | |
| Five modifications for the Ph.II Synchromesh Gearbox. | 11th Sep 1934 | Box 15 \ 5 Scan406 | |
| Instruction to experiment with a gearbox sleeve and cam pins, changing their angle from 50º to an alternative of 45º. | 13th Sep 1934 | Box 15 \ 5 Scan407 | |
| Modifications to the P.2. S.M. 2nd Gearbox to facilitate assembly and prevent binding. | 24th Oct 1934 | Box 15 \ 5 Scan408 | |
| Modifications to the P.2. S.M.2. Gearbox for improved casing removal. | 26th Oct 1934 | Box 15 \ 5 Scan409 | |
| Spring length discrepancy on the P 2 S M 2nd Gearbox and proposing revised specifications. | 9th Nov 1934 | Box 15 \ 5 Scan410 | |
| Use of full depth nuts instead of lock nuts for bolts on a P 2 BM 2nd Gearbox. | 9th Nov 1934 | Box 15 \ 5 Scan411 | |
| Standardisation of undersheets in connection with new gearbox and engine mounting. | 16th Oct 1934 | Box 15 \ 5 Scan412 | |
| Assessing the standardization of parts, detailing costs and production implementation. | 20th Oct 1934 | Box 15 \ 5 Scan413 | |
| Standardisation of parts for a gearbox with synchromesh 2nd gear. | 16th Oct 1934 | Box 15 \ 5 Scan414 | |
| Cost comparison and production details for a new part, including labour, charges, and tooling costs. | 10th Oct 1934 | Box 15 \ 5 Scan415 | |
| Query regarding the technical objections to implementing synchromesh on more gears in the gearbox. | 12th Apr 1935 | Box 15 \ 5 Scan416 | |
| Performance of the synchromesh second speed on the Phantom gearbox. | 15th Apr 1935 | Box 15 \ 5 Scan417 | |
| Complaints of second gear jumping out on Phantom II cars and the proposed solution. | 13th Aug 1935 | Box 15 \ 5 Scan418 | |
| Complaints of the second gear jumping out on P.2 cars. | 14th Aug 1935 | Box 15 \ 5 Scan419 | |
| Recurring issue with the second gear jumping out on the Phantom II model. | 17th Aug 1935 | Box 15 \ 5 Scan420 | |
| Cases of the second gear jumping out on the Phantom II model. | 19th Aug 1935 | Box 15 \ 5 Scan421 | |
| Request to find a car with a Phantom gearbox fault for testing and measurement before any alterations are made. | 20th Aug 1935 | Box 15 \ 5 Scan422 | |
| Confirming tests to investigate the Phantom II second speed gear jumping out. | 21th Aug 1935 | Box 15 \ 5 Scan423 | |
| Chain discussing the progress of a patent application for a back axle. | 19th Sep 1910 | Box 15 \ 6 Scan001 | |
| To Mr. Johnson regarding the completion of drawings for a back axle patent. | 18th Oct 1910 | Box 15 \ 6 Scan002 | |
| Clarifying the facts regarding the preparation of patent materials for the 1600 axle. | 20th Oct 1910 | Box 15 \ 6 Scan003 | |
| Situation with Mr. Nadin regarding the format of drawings and specifications. | 7th Oct 1910 | Box 15 \ 6 Scan004 | |
| Patent application for a back axle and steering column control arrangement. | 24th Oct 1910 | Box 15 \ 6 Scan005 | |
| The transfer of Letters Patent for steering and controlling motor vehicles. | 4th Feb 1911 | Box 15 \ 6 Scan006 | |
| Internal communication regarding the date and expiry of S.C.H. Knight's first patent, number 14729/05. | 13th Feb 1911 | Box 15 \ 6 Scan007 | |
| Query and response regarding the expiry date of the Knight patent. | 25th Feb 1911 | Box 15 \ 6 Scan008 | |
| Departmental memo to Mr Barrington listing patent numbers from the years 1882 to 1901. | 28th Oct 1911 | Box 15 \ 6 Scan009 | |
| Departmental memo, page 2, listing reference numbers by year from 1901 to 1908. | 27th Jun 1911 | Box 15 \ 6 Scan010 | |
| Departmental memo sheet acting as a separator, noting page number -3- and reference numbers. | 27th Jun 1911 | Box 15 \ 6 Scan011 | |
| Cover letter forwarding a copy of a memorandum concerning patent matters. | 24th Nov 1911 | Box 15 \ 6 Scan012 | |
| To Mr. DeLoose regarding an arrangement with solicitors and the Sales Department. | 24th Nov 1911 | Box 15 \ 6 Scan013 | |
| Excerpt from meeting minutes regarding a patent application for a pneumatic suspensory device. | 1st Dec 1911 | Box 15 \ 6 Scan014 | |
| Letter to the Patents Office requesting copies of patent specifications, with a handwritten reply from the office. | 9th Jan 1912 | Box 15 \ 6 Scan015 | |
| From the Patent Office regarding the inability to supply two requested patent specifications. | 10th Jan 1912 | Box 15 \ 6 Scan016 | |
| Guide from the UK Patent Office Sale Branch on specifications of patents and related publications. | 1st Oct 1911 | Box 15 \ 6 Scan017 | |
| Internal instruction to order various Patent Office publications and specifications. | 18th Jan 1912 | Box 15 \ 6 Scan018 | |
| Letter to the Comptroller of the Patents Office requesting copies of patent specifications and enclosing payment. | 18th Jan 1912 | Box 15 \ 6 Scan019 | |
| From the Patent Office regarding an out-of-print specification. | 19th Jan 1912 | Box 15 \ 6 Scan020 | |
| Letter to the Patents Office requesting copies of several patent specifications. | 2nd Oct 1912 | Box 15 \ 6 Scan021 | |
| From the Patent Office regarding an out-of-print specification. | 3rd Oct 1912 | Box 15 \ 6 Scan022 | |
| That leaflets of specifications for vehicle wheels be bound. | 14th Oct 1912 | Box 15 \ 6 Scan023 | |
| Letter to Mr. Johnson regarding the capabilities of patent agents, Messrs Phillipss, and a revised process for patent submissions. | 17th Oct 1912 | Box 15 \ 6 Scan024 | |
| Letter discussing errors and performance issues with patent applications handled by external patent agents. | 17th Oct 1912 | Box 15 \ 6 Scan025 | |
| Strategy and selection of patent agent firms. | 21th May 1926 | Box 15 \ 6 Scan026 | |
| Recommendation on evaluating and potentially changing patent agents, mentioning Messrs Marks & Clerk and Messrs Philipss. | 21th May 1926 | Box 15 \ 6 Scan027 | |
| Departmental memo from Mr. Johnson instructing to apply for patents in the United States. | 17th Dec 1912 | Box 15 \ 6 Scan028 | |
| Maybach patent (No. 3235/01) for a honeycomb type radiator. | 13th Jan 1913 | Box 15 \ 6 Scan029 | |
| Departmental memo forwarding a letter from Phillips regarding Patent No. 22710/11 concerning dashboards and bodies. | 18th Apr 1913 | Box 15 \ 6 Scan030 | |
| Letter proposing a patent non-leakable tap for motor cars, including a demonstration model. | 13th May 1913 | Box 15 \ 6 Scan031 | |
| Page two of a letter from an inventor, Percy E. Whyte, offering a vibration-proof tap for trial and potential commercialisation. | 16th May 1913 | Box 15 \ 6 Scan032 | |
| Letter to Mr. P. E. Whyte returning his patent tap and declining his invention. | 16th May 1913 | Box 15 \ 6 Scan033 | |
| Memo discussing a patent application for epicyclic gears and a complaint against Messrs. Phillips. | 22th May 1913 | Box 15 \ 6 Scan034 | |
| Internal correspondence regarding Canadian application No/165949 and a related British application. | 27th May 1913 | Box 15 \ 6 Scan035 | |
| Patents for a Mercedes gearbox, attaching related correspondence. | 27th May 1913 | Box 15 \ 6 Scan036 | |
| Foreign applications for British patents and a query about French patents. | 27th May 1913 | Box 15 \ 6 Scan037 | |
| Covering note for correspondence regarding the Sheffield Simplex infringement of rear axle control patents. | 27th May 1913 | Box 15 \ 6 Scan038 | |
| Correspondence for keeping French Patent 428744 in force. | 27th May 1913 | Box 15 \ 6 Scan039 | |
| The Mercedes Change Speed Control Patent and a related license. | 27th May 1913 | Box 15 \ 6 Scan040 | |
| Status of three patent applications. | 4th Jun 1913 | Box 15 \ 6 Scan041 | |
| Providing updates on a list of numbered engineering topics. | 22th May 1913 | Box 15 \ 6 Scan042 | |
| Potential suspension, gearbox, and axle control systems. | 7th Jun 1913 | Box 15 \ 6 Scan043 | |
| The infringement of slipper drive patents by Lanchester. | 7th Jun 1913 | Box 15 \ 6 Scan044 | |
| Handover memorandum concerning files and documents for patent and infringement matters. | 7th Jun 1913 | Box 15 \ 6 Scan045 | |
| Expense claim for a visit to London regarding costs for Lanchester patents. | 10th Jun 1913 | Box 15 \ 6 Scan046 | |
| Mr. Royce's remarks on an external gear box invention, routing it for filing. | 20th Aug 1913 | Box 15 \ 6 Scan047 | |
| Cover memo attaching several other memos and a report from P.S. Jones regarding patent work. | 9th Sep 1913 | Box 15 \ 6 Scan048 | |
| Attaching correspondence regarding patent work X.728. | 10th Sep 1913 | Box 15 \ 6 Scan049 | |
| Letter regarding an application for a Patent of Addition for engine suspension, enclosing the signed form and a blueprint. | 15th Sep 1913 | Box 15 \ 6 Scan050 | |
| Correspondence enclosing a signed patent application for improvements in adjusting and locking devices. | 17th Sep 1913 | Box 15 \ 6 Scan051 | |
| Patent application for improvements in and relating to a hydraulically operated brake mechanism. | 17th Sep 1913 | Box 15 \ 6 Scan052 | |
| Patenting of an epicyclic gear design in combination with a jaw clutch reverse gear. | 18th Sep 1913 | Box 15 \ 6 Scan053 | |
| Enclosing signed petitions for three patents regarding improvements to gearing and engine/transmission mounting. | 6th Nov 1913 | Box 15 \ 6 Scan054 | |
| Short memo regarding the validity and potential use of a patent. | 10th Nov 1913 | Box 15 \ 6 Scan055 | |
| Letter enclosing a signed patent application form, specification, and blueprint for a brake mechanism. | 1st Dec 1913 | Box 15 \ 6 Scan056 | |
| Cover letter forwarding a letter about an outside invention from an employee to the relevant department. | 8th Apr 1914 | Box 15 \ 6 Scan057 | |
| Correspondence regarding patent specifications for an adjustable engine stand from a Mr Maxwell. | 21th May 1914 | Box 15 \ 6 Scan058 | |
| Letter from J.B. Ferguson's in Belfast regarding photographs of an adjustable engine stand. | 21th May 1914 | Box 15 \ 6 Scan059 | |
| Letter to Mr. Maxwell regarding a patent stand for supporting engines during assembly. | 21th May 1914 | Box 15 \ 6 Scan060 | |
| Returning photographs and specifications for a portable engine stand, deeming the invention to be of no value. | 26th May 1914 | Box 15 \ 6 Scan061 | |
| Attaching correspondence with Mr. Fuller regarding patents in America. | 25th May 1927 | Box 15 \ 6 Scan062 | |
| Letter clarifying an agreement on patent rights between the English and American companies. | 25th May 1927 | Box 15 \ 6 Scan063 | |
| Letter outlining the agreement on patent applications between the American and English companies. | 12th May 1927 | Box 15 \ 6 Scan064 | |
| New British provisional patent ideas for carburetters. | 29th Oct 1927 | Box 15 \ 6 Scan065 | |
| The handling of a brake patent, its American counterpart, and licensing. | 29th Nov 1927 | Box 15 \ 6 Scan066 | |
| Technical memo discussing a provisional patent and design improvements for carburettors, including a sketch. | 30th Nov 1927 | Box 15 \ 6 Scan067 | |
| Continued memo discussing the function of a carburetter air valve and a suggested tulip restrictor. | 8th Dec 1927 | Box 15 \ 6 Scan068 | |
| Provisional patent application for a suggested alteration in valve arrangement to prevent detonations. | 8th Dec 1927 | Box 15 \ 6 Scan069 | |
| Provisional patent for an improvement in the design of combustion chambers and valve arrangements in internal combustion engines. | 8th Dec 1927 | Box 15 \ 6 Scan070 | |
| The operation and advantages of an intermediate valve design for internal combustion engines. | 8th Dec 1927 | Box 15 \ 6 Scan071 | |
| Letter from Clarence A. Brook to Mr. M. Olley regarding prints and patents for rear springs and shock absorbers. | 13th Oct 1928 | Box 15 \ 6 Scan072 | |
| Letter from an inventor offering a new 'torque booster' transmission system for consideration and trial. | 29th Oct 1928 | Box 15 \ 6 Scan073 | |
| Page two of a letter from John Craig regarding the cost and potential of a 'torque booster'. | 28th Nov 1923 | Box 15 \ 6 Scan074 | |
| Improved bonnet seating product from the Gandy Belt Manufacturing Co. | 28th Nov 1923 | Box 15 \ 6 Scan075 | |
| Letter to F.H. Royce concerning Stanton's Patents for engine spark and carburation control. | 9th Feb 1929 | Box 15 \ 6 Scan076 | |
| Technical description of ignition advance and carburation control mechanisms. | 9th Feb 1929 | Box 15 \ 6 Scan077 | |
| Report page detailing engine performance regarding carburation, spark advance, and detonation. | 9th Feb 1929 | Box 15 \ 6 Scan078 | |
| Letter discussing the development of a device, drawings, samples, and challenges with poppet valves. | 7th Mar 1929 | Box 15 \ 6 Scan079 | |
| Letter from a patent agent regarding British Patent No. 269167 for improvements to combustion chambers. | 7th Mar 1929 | Box 15 \ 6 Scan080 | |
| Testing of Dardelet special self-locking threads on a chassis or engine. | 1st May 1929 | Box 15 \ 6 Scan081 | |
| Rejection letter for an invention concerning combustion chambers as it is not relevant to their 4-stroke petrol engines. | 26th Jun 1929 | Box 15 \ 6 Scan082 | |
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