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).
Hand-drawn sketch of four circuit diagrams, labeled FIG 1 to FIG 4.

Identifier  ExFiles\Box 163\6\  img012
Date  30th January 1930 guessed
  
2, 2R, FIG 1., FIG 2, FIG. 3, FIG 4.
  
  


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