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US Patent: 490,432
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Patentee:
Wilhelm Gerhardt (exact or similar names) - Berlin, Germany

USPTO Classifications:
269/100, 269/101

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
W. Haupt
W. H. Edwards
Patent Dates:
Applied: Apr. 08, 1892
Granted: Jan. 24, 1893

Patent Pictures:
Fig. 1
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