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US Patent: 1,493,779
Pneumatic sanding pad
Patentee: Hugh Humphreys (exact or similar names) - Grand Rapids, MI USPTO Classifications: 451/303, 451/505 Tool Categories: woodworking machines : sanding machines Assignees: Oliver Machinery Co. - Grand Rapids, MI Manufacturer: Oliver Machinery Co. - Grand Rapids, MI Witnesses: Unknown	Patent Dates: Applied: Feb. 28, 1921 Granted: May 13, 1924 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Oliver Machinery Co.

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