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LL/101078
D.W. Van Riper
1870, 6 September (patent)
Patent no.: 107,129, D.W. Riper, Photographic Background

Patent illustration
US Patent Office
D.W. (Daniel Wilson) Van Riper
 
(Alan Griffiths, 8 June 2020) I'm indebted to Lee Eltzroth for bringing this to my attention.
 
LL/101078


 

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