If you find a patent number or patent date by this manufacturer that is not on this
list, please contact the Site Historian.
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
a special TIFF viewer must be installed with your browser in order properly work.
More information on how to configure your computer to view these patents can be
found at TIFF image Viewers
for Patent Images.
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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280,824
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Jul. 10, 1883
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Portable forge
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John P. Holt |
Cleveland, OH |
See also patent 219,640.
An 1887 ad (see images) from Holt Mfg. Co. features this portable forge. In 1878 the inventor was superintendent of the Cleveland Steam Gauge Co. |
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394,857
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Dec. 18, 1888
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Anvil and vise attachment
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John P. Holt |
Cleveland, OH |
From the 1889-05-09 The Iron Age: "Holt Mfg. Company, Cleveland, Ohio, issued a circular describing their Combined Anvil and Vise, the invention of their John P. Holt. It is reported as meeting with a large and satisfactory sale. The vise it so made that it can be separated from the anvil by driving ou the key with a single stroke of the hammer, and can be used as a clamp separate from the anvil. The back jaw has a lip projecting over upon the anvil, so that anything held by the vise can sustain heavy hammering." |
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31,850
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Aug. 01, 1889
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Combined anvil and vise
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John P. Holt |
Cleveland, OH |
This is the Canadian equivalent of US patent 394,857. |