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US Patent: 229,614
Treadle Mechanism for Dental Engine
Patentee: William A. Johnson (exact or similar names) - Edgewater, Richmond County, NY USPTO Classifications: 433/113, 74/561 Tool Categories: specialty machines : dental apparatus propulsion and energy : human powered apparatus Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 30, 1880 Granted: Jul. 06, 1880 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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