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US Patent: 2,486,645
Toolmaker's optical instrument having mounting features and scale graduations
Patentee: Emil F. Hager (exact or similar names) - Queens Village, NY USPTO Classifications: 116/230, 116/300, 33/838, 359/393 Tool Categories: metalworking tools : machinist tools : measuring tools : optical measuring gauges Assignees: None Manufacturer: E. F. Hager & Son - Queens Village, NY Witnesses: Unknown	Patent Dates: Applied: May 18, 1945 Granted: Nov. 01, 1949 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for E. F. Hager & Son
Description: This device is for measuring precision screw threads, gear-teeth distances and angles, etc.

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