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US Patent: 291,137
Device for Drilling Square Holes
Patentee:
Ernst Herrmann Bieber (exact or similar names) - New York, NY

USPTO Classifications:
82/1.3

Tool Categories:
metalworking machines : drilling and boring : drill bits

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Apr. 17, 1883
Granted: Jan. 01, 1884

Patent Pictures:
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