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US Patent: 2,561,753
Change-Speed Drive for Machine Tool Spindles
Patentees: William Wallace Potter (exact or similar names) - Pawtucket, Providence County, RI Alfred Joseph Fuller (exact or similar names) - Pawtucket, Providence County, RI USPTO Classifications: 74/325, 74/333 Tool Categories: metalworking machines : metalworking machine mechanisms Assignees: Niles-Bement-Pond Co. - West Hartford, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 26, 1944 Granted: Jul. 24, 1951 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Niles-Bement-Pond Co.

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