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US Patent Certs for Mining Processes - 2 [147798]

Currency:USD Category:Collectibles / Mining Start Price:40.00 USD Estimated At:80.00 - 120.00 USD
US Patent Certs for Mining Processes - 2  [147798]
SOLD
40.00USDto 6*******d+ buyer's premium (10.00)
This item SOLD at 2022 Apr 23 @ 10:08UTC-7 : PDT/MST
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Two US Patent Certificates granted to Leroy E. Sowers & Preston S. Phillips, for Processes of Separating Manganese Dioxide from ore containing the same, on August 27th, 1918, Patent Nos 1277144 & 1277145. Each certificate includes description of invention, including a drawing of same, bound together by a ribbon, and Red Seal certified by the Patent Office of America (8 x 12", 4 pages, on heavy stock). City: State: Date: