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LL/99287
William A. Pratt
1846, 14 March
Improvement in Coloring Daguerreotype-Pictues [US Letters Patent No. 4,423]

Patent
US Patent Office
(Alan Griffiths, 29 April 2020) I'm indebted to Michael Lehr for bringing this patent to my attention.
 
LL/99287


 

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