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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).
Material used for Delco distributor tracks, clarifying a switch from Bakelite to hard rubber.

Identifier  ExFiles\Box 163\7\  img015
Date  9th April 1921 guessed
  
X.4284 D.{John DeLooze - Company Secretary}

Extract from Cy1/G7321.

X.4275 - AMERICAN BOSCH BATTERY IGNITION.

In continuation of my letter of March 4, 1921 on this subject, replying to Mr. Royce's letter of Feb. 16th I wish to add the following notes :-

X.4284.

Referring to the Delco distributor, we believe that this company does not now use Bakelite for any distributor tracks, this practice having given the makers a great deal of trouble in the early days. We think Mr. Royce will find that all the Delco distributors are a special sort of hard rubber.
  
  


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