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US Patent: 158,525
Air-Vacuum Engines
Patentee: Alexander K. Rider (exact or similar names) - Walden, Orange County, NY USPTO Classifications: 60/370 Tool Categories: propulsion and energy : external combustion engines : hot air engines Assignees: Rider, Wooster & Co. - Walden, Orange County, NY Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 20, 1874 Granted: Jan. 05, 1875 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Rider-Ericsson Engine Co.

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