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US Patent: 1,660,579
Drill attachment
Hammer drill attachment for electric drill
Patentee:
Joseph Roth - New York, NY

USPTO Classifications:
173/203, 74/56

Tool Categories:
woodworking machines : handheld power tools : handheld power tool accessories

Assignees:
Harold I. Williams - New York, NY
Joseph Roth - New York, NY

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Apr. 16, 1927
Granted: Feb. 28, 1928

Patent Pictures:
USPTO pdf tiff
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Description:
Conversion Tool

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