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US Patent: 191,304
Improvement in wire screws and nuts
Patentee:
John T. Bruen - Brooklyn, NY

USPTO Classifications:
140/105, 408/124

Tool Categories:
screwdrivers : screwdriver mechanisms : spiral screwdrivers
woodworking tools : hand drills

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. Sedgwick
Alex. F. Roberts

Patent Dates:
Applied: Apr. 02, 1877
Granted: May 29, 1877

Patent Pictures:
USPTO pdf tiff
Google Patents
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Description:
Describes how to twist wires together to form the shaft of an Archimedean device and than fit a nut to it.

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