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).
Advertisement for various extension speaker models, their specifications, and pricing.
| Identifier | ExFiles\Box 168b\1\ img051 | |
| Date | 1st January 1938 guessed | |
| EXTENSION SPEAKER MODELS Model L628T (12 volts) Model L628S (6 volts) For Coaches: Model L628T.C. (12 volts) Size 8 ¾" x 9 ½" x 6 ¼". Miniature P.M. Speaker Size 7" x 5¼" x 2¼" Oversize Energised Speaker Size 9¼" diameter, 5" deep For LIMOUSINE CARS and MOTOR COACHES, Model L628T.C. For YACHTS and MOTOR BOATS, Model L628 marine covering the Trawler Telephony wave band (113.2 to 300 metres) as well as the long wave band. PRICE £17 . 17 . 0 DEFERRED TERMS: Deposit £3 15 0, and 12 payments of 25/8, not including installation charges. ALL OTHER MAKES COMBINED | ||