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William A. Pratt 
Improvement in Coloring Daguerreotype-Pictues [US Letters Patent No. 4,423] 
1846, 14 March 
  
Patent 
US Patent Office 
 
LL/99287 
  
(Alan Griffiths, 29 April 2020) I'm indebted to Michael Lehr for bringing this patent to my attention. 
 

 
  
 
  
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