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).
Blueprint detailing a modification to a 20/25 Piston, part number E 56610.
| Identifier | ExFiles\Box 86\2\ scan0012 | |
| Date | 8th March 1933 | |
| Ex/10694 ROLLS-ROYCE, LTD PRINT ROOM MAR 8 1933 DERBY. .74935 DIA +1.5/0 ALL OTHER DIMS ETC TO E 56610 UNDERCUT AND RECESS IN BORE ARE DELETED MODIFCN To 20/25 PISTON E 56610 Ex 10694 | ||