From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Outside patent searches listing specifications open to public inspection.
| Identifier | ExFiles\Box 147\2\ scan0304 | |
| Date | 25th April 1940 | |
| OUTSIDE PATENT SEARCHES. REPORT BY CLAREMONT HAYNES & CO. WEEK ENDING 25th April 1940. SPECIFICATION not yet accepted which have become open to public inspection. ------------- No. Patentee. Title. 1939 20042 Junkers Flugzeug- und Motorenwerke A.G Aircraft 27702 General Motors Cor- poration. Spark plug insulators. ------------- Copies of these, or extracts from them can be obtained if desired. | ||