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US Patent: 2,521,820
Optical Comparator for Testing Cams
Patentees: Robert O. Beardsley (exact or similar names) - Springfield, Windsor County, VT Leon B. Fuller (exact or similar names) - Springfield, Windsor County, VT USPTO Classifications: 33/519, 33/545, 356/391 Tool Categories: metalworking tools : machinist tools : measuring tools : comparators Assignees: Jones & Lamson Machine Co. - Springfield, Windsor County, VT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Nov. 14, 1946 Granted: Sep. 12, 1950 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Jones, Lamson & Co.

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