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US Patent: 508,196
Machine for grinding the edges of spectacle or eyeglass lenses
Patentees:
Hugo Bilgram (exact or similar names) - Philadelphia, PA
Thomas A. Willson (exact or similar names) - Reading, PA

USPTO Classifications:
451/123, 451/134, 451/137, 451/460, 79/16, 82/170, 82/18

Tool Categories:

Assignees:
Thomas A. Willson - Reading, PA

Manufacturer:
Not known to have been produced

Witnesses:
H. D. Dunn
Alfred H. Faber

Patent Dates:
Applied: Aug. 04, 1892
Granted: Nov. 07, 1893

Patent Pictures:
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Google Patents
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Vintage Machinery entry for Hugo Bilgram, Bilgram Machine Works

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