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Frederick Langenheim 
Label "The Ground Glass of this Instrument is used by authority _ under F. Langenheim's Patent of Nov. 19th 1850." 
1850, 19 November (patent) 
  
Label 
Ebay 
eBay number: 333490191122. 
  
 
LL/96518 
  
Paper label inside a Beckers viewer. 
 

 
  
 
  
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