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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).
Page 2 of a letter from Lodge Plugs Ltd. regarding the performance of spark plugs.

Identifier  ExFiles\Box 162\6\  img129
Date  7th April 1932
  
From Lodge Plugs Ltd.
To Messrs. Rolls-Royce Ltd.
Sheet No 2.
Date 7 April 1932.

miles, driving it most of the time on full throttle, and the original set of plugs is still functioning perfectly satisfactorily.

We should be glad to hear from you if you find the C3. plugs satisfactory in the high compression engines, or if you desire us to submit you a mica plug to withstand still greater heat than the Model C3.

Yours faithfully,

LODGE PLUGS LIMITED
Bernard Hopps
DIRECTOR
  
  


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