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US Patent: 661,874
Double Cylinder Pump
Patentee: Warren Hull (exact or similar names) - Gasport, Niagara County, NY USPTO Classifications: 417/536, 417/544, 92/138, 92/151 Tool Categories: industrial machines : pumps : hand pumps Assignees: Warren Hull - Gasport, Niagara County, NY Arthur B. Hull - Gasport, Niagara County, NY John C. Hull - Gasport, Niagara County, NY Manufacturer: Friend Mfg. Co. - Gasport, Niagara County, NY Witnesses: J. D. Northrup M. A. Mesler Jason K. McCathran Louis G. Julihn	Patent Dates: Applied: May 15, 1900 Granted: Nov. 13, 1900 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Friend Mfg. Co.

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