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US Patent: 1,738,405
Screw Driver
Improvement in Screwdriver blades
Patentee:
Bernhard Thal - Chelsea, MA.

USPTO Classifications:
81/436, 81/441

Tool Categories:
screwdrivers : screwdriver blades

Assignees:
Bridgeport Hardware Manufacturing Co. - Bridgeport, CT. United States

Manufacturer:
Bridgeport Hardware Manufacturing Co. - Bridgeport, CT. United States

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 28, 1929
Granted: Dec. 03, 1929

Patent Pictures: [ 1 | 2 | 3 | 4 ]
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Description:
This Patent and two others,1741349 and 1782981 relates to a serrated/grooved tip, which helps to prevent the slipping off the screw will turning. Sample is marked with Patent #'s 1738405 &1741349, other Patents pending. Also marked NON-SKID #1 Bridgeport,U.S.A. Also see Patent267709

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