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D.W. Van Riper 
Patent no.: 107,129, D.W. Riper, Photographic Background 
1870, 6 September (patent) 
  
Patent illustration 
US Patent Office 
 
LL/101077 
  
D.W. (Daniel Wilson) Van Riper
 
(Alan Griffiths, 8 June 2020) I'm indebted to Lee Eltzroth for bringing this to my attention. 
 

 
  
 
  
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