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US Patent: 1,408,339
Protractor
Protractor for Optical Work
Patentee:
Lucian W. Bugbee (exact or similar names) - Indianapolis, IN

USPTO Classifications:
33/568, 451/460

Tool Categories:
layout tools : protractors

Assignees:
American Optical Co. - Southbridge, MA

Manufacturer:
Not known to have been produced

Witnesses:
Harry Still
H. K. Parsons

Patent Dates:
Applied: Nov. 14, 1917
Granted: Feb. 28, 1922

Patent Pictures:
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Report data errors or omissions to steward Ralph Brendler
Description:
This protractor is specially designed to assist in laying out the grinding for bifocal lenses.

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