If you find a patent number or patent date by this manufacturer that is not on this
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Key to Links for Patent Information
USPTO = U.S. Patent Office .
Images of the actual patent can be viewed on the U.S. Patent Office web site but
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More information on how to configure your computer to view these patents can be
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DATAMP = Directory of American Tool And
Machinery Patents . A sister site to VintageMachinery.org with information
on patents related to machinery and tools. A much easier user interface than the
USPTO's for finding information on machinery patents.
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2,274,448
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Feb. 24, 1942
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Motor driven hand tool
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Edward M. Hoover |
Anderson, IN |
This tool was intended to be driven by a flexible shaft—though it was also suited for integral electric motor drive—and was "for use by die makers and engravers". The innovation is a mechanism for converting rotary to reciprocating movement "so that they tool may be used for filing, chipping, routing, cutting and the like." This invention was manufactured by the assignee as the "H & H All-in-One electric tool". They first introduced such a tool by 1939 and was produced until at least 1947. |