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US Patent: 1,800,341
Rotary abrasive machine
Patentee:
John D. Davies - Scranton, PA

USPTO Classifications:
15/385, 280/79.11, 451/354, 451/359

Tool Categories:
woodworking machines : handheld power tools : handheld sanders
woodworking machines : sanding machines : handheld sanders

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Oct. 19, 1928
Granted: Apr. 14, 1931

Patent Pictures:
USPTO pdf tiff
Google Patents
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Description:
"It is a well known fact that... slate black-boards, due to improper washing and removal of crayon, become coated and crystallized..."

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