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US Patent: 191,826
Machines for Cutting Screw Threads
Patentee:
Louis Bollmann (exact or similar names) - Vienna, Austria

USPTO Classifications:
174/53, 409/73, 409/78

Tool Categories:
metalworking machines : metal threading machines

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Jan. 03, 1877
Granted: Jun. 12, 1877

Patent Pictures:
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