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LL/96518
Frederick Langenheim
1850, 19 November (patent)
Label "The Ground Glass of this Instrument is used by authority _ under F. Langenheim's Patent of Nov. 19th 1850."

Label
Ebay
eBay number: 333490191122.
 
Paper label inside a Beckers viewer.
 
LL/96518


 

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