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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 discussing the supply and convenience of different filter types.

Identifier  ExFiles\Box 116\1\  scan0041
Date  28th June 1938
  
-2-

Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews}23/JH.

28th June, 1938.

and full information can be obtained from them. Should these people be not quite in a position to supply, you the next best filter in our opinion is the A.C. filter, but this type is not so convenient as the 'General' type when replacements are made.

If you take these precautions we feel certain that the results obtained will surprise you.

Yours faithfully,

FOR ROLLS-ROYCE LTD.
  
  


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