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US Patent: 1,640,933
Floor-surfacing machine
Patentee: Lester M. Gries (exact or similar names) - Detroit, MI USPTO Classifications: 451/350, 451/352 Tool Categories: woodworking machines : sanding machines Assignees: Master Woodworker Mfg. Co. - Detroit, MI United Tool & Mfg. Co. - Detroit, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Nov. 10, 1925 Granted: Aug. 30, 1927 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Master Woodworker Mfg. Co.
Description: The patent is quite unusual because it is jointly assigned to two separate companies.

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