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US Patent: 158,807
Improvement in Screw-Drivers
Patentee:
William F. Patterson - Boston, MA

USPTO Classifications:
7/165, 81/438

Tool Categories:
screwdrivers : screwdriver blades

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. A. Shaw
H. E. Metcalf

Patent Dates:
Applied: Nov. 02, 1874
Granted: Jan. 19, 1875

Patent Pictures:
USPTO pdf tiff
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