Rolls-Royce Archives
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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).
Photograph of a fractured spark plug.

Identifier  ExFiles\Box 162\1\  img037
Date  12th January 1939 guessed
  
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