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US Patent: 922,080
Micrometer Screw Driver
Watch Makers Screwdriver
Patentee:
George W. Bowers - Somerville, CT

USPTO Classifications:
81/3.2, 81/6

Tool Categories:
screwdrivers

Assignees:
Kendrick and Davis - Lebanon, NH

Manufacturer:
Kendrick and Davis - Lebanon, NH

Witnesses:
A. H. Brown
C. F. Brown

Patent Dates:
Applied: Nov. 04, 1907
Granted: May 18, 1909

Patent Pictures: [ 1 | 2 ]
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Description:
This Patent relates to screw drivers and the ability to measure the amount of rotation of the screw. This is is especially important in adjusting the timing screws,( or mean time screws) on a watch balance wheel. The screws regulate or adjust the the arc or balance of the wheel.

Sold as K&D #423 Micrometer screwdriver, a small micrometer on the blade keeps track of micro rotations on the blade. Sample marked "K&D Patented May 18, 09"

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