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US Patent: 189,889
Expanding Screw Tap
Patentee:
John Brown Douglas (exact or similar names) - Philadelphia, PA

USPTO Classifications:
408/154

Tool Categories:
metalworking tools : taps and dies

Assignees:
Morris, Tasker & Co., Ltd. - Philadelphia, PA

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 03, 1877
Granted: Apr. 24, 1877

Patent Pictures:
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