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Old 19th October 2012 | 00:31
  #3111 (permalink)  
Karlark
 
Joined: Oct 2011
Posts: 796
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From: Minnesota
It was the Birger "Ad Asrtra" silencer fitted to a D.H.9C as per an article in "fright" archive:

siddeley puma | 1921 | 0816 | Flight Archive
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