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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)
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