US Patent: 697,836 - Screw-driver


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US Patent: 697,836

Screw-driver

Patentee:

John Gilman Gorham (exact or similar names) - Mansfield, OH

USPTO Classifications:

81/436

Tool Categories:

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Ed Stoter

John H. Coss

Patent Dates:
Applied:	Jul. 29, 1901
Granted:	Apr. 15, 1902

Patent Pictures:

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Description:

Invention is a screwdriver-shank with ribs that extend down to either side of the tip. These ribs strengthen the shank, and keep the shaft centered on the screw.