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).
With a sketch comparing a parallel tube and a bulged tube.

Identifier  ExFiles\Box 15\1\  Scan387
Date  25th September 1930
  
Parallel □ Tube E81385-
Bulged □ " E81389.

16 / L62

ROLLS-ROYCE, LIMITED
PRINT ROOM,
25 SEP 1930
  
  


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