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US Patent: 1,478,956
Exposure meter
Patentee: Elmer Harrold (exact or similar names) - Leetonia, OH USPTO Classifications: 116/213, 235/64.7 Tool Categories: Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 11, 1922 Granted: Dec. 25, 1923 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Crescent Machine Co.
Description: Invention is a photographic exposure meter, and is of interest because the inventor was a co-founder of Crescent Machine Co.

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