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Standard
  
  
Langenheim, Lloyd & Co. 
Picture Gallery, Smithsonian Institute. 
1856 
  
Stereoview 
Internet - Original source ill-defined 
Source requested (23 March 2019). 
  
 
LL/90021 
  
American Stereoscopic Co., Langenheim, Lloyd & Co.
 
Albumen on glass stereo transparency.
 
U.S. Patent - Frederick Langenheim (Philadelphia, Pa.) , Nov. 19, 1850, "For Improvements in Photographic Pictures on glass, &c." 
 

 
  
 
  
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