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US Patent: 441,570
Lens Grinding Machine
Patentee:
Richard B. H. Leighton (exact or similar names) - Philadelphia, PA

USPTO Classifications:
142/1, 451/123, 451/227, 451/277, 451/294, 451/42

Tool Categories:
specialty machines : material grinding machines

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 06, 1890
Granted: Nov. 25, 1890

Patent Pictures:
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