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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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