US Patent: 1,107,701 - Spiral tool-driver


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US Patent: 1,107,701

Spiral tool-driver

Patentee:

Grover Plein (exact or similar names) - Racine, WI

USPTO Classifications:

7/146, 7/165, 74/127

Tool Categories:

screwdrivers : screwdriver mechanisms : spiral screwdrivers

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Mabel L. Plein

George E. Dahl

Patent Dates:
Applied:	Jan. 24, 1910
Granted:	Aug. 18, 1914

Patent Pictures:

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Description:

This a improvement on Patent # 1054142.Plein has decided he needs the ability to lock the spiral screwdriver so the other parts of the tool can function.