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US Patent: 150,840
Treadles
Patentees: Edward Duffy (exact or similar names) - Oakland, Alameda County, CA Robert Swarbrick (exact or similar names) - Oakland, Alameda County, CA USPTO Classifications: 74/136 Tool Categories: propulsion and energy : human powered apparatus Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 04, 1874 Granted: May 12, 1874 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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