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US Patent: 1,447,913
Recording Indicator
Patentees: Augustus Trowbridge (exact or similar names) - Washington, DC William C. Duryea (exact or similar names) - Princeton, Mercer County, NJ USPTO Classifications: 346/107.1, 346/4, 346/49, 73/114.18 Tool Categories: industrial tools : pressure indicators propulsion and energy : internal combustion engines : internal combustion engine indicators industrial machines : industrial recording apparatus Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 05, 1920 Granted: Mar. 06, 1923 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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