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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: USPTO (New site tip) Google Patents 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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