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US Patent: 1,252,365
Ball Grinding Machine
Patentee:
Otto W. Schaum (exact or similar names) - Philadelphia, PA

USPTO Classifications:
451/284

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Edwin A. Packard
G. McGrann
Patent Dates:
Applied: Mar. 24, 1917
Granted: Jan. 01, 1918

Patent Pictures:
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