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).
Technical drawing of a Hispano front brake drum, specifying materials and dimensions.

Identifier  ExFiles\Box 128\1\  scan0121
Date  31th October 1931 guessed
  
HISPANO FRONT BRAKE DRUM., MATERIAL - ALUMINIUM WITH STEEL LINER., .800, .210, 2.500, 8 M/M DIA., .180, .320, STEEL LINER., .300, 15.750 DIA., 10 M/M STUDS, 4.925 DIA., WEIGHT = 16 LBS. 9 OZS.
  
  


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