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Langenheim, Lloyd & Co.
Picture Gallery, Smithsonian Institute.
1856
Stereoview, detail
Internet - Original source ill-defined
Source requested (23 March 2019).
LL/90022
Albumen on glass stereo transparency.
U.S. Patent - Frederick Langenheim (Philadelphia, Pa.), Nov. 19, 1850, "For Improvements in Photographic Pictures on glass, &c."
American Stereoscopic Co., Langenheim, Lloyd & Co.
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