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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92,877
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May. 02, 1905
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Gang saw
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Alexander Dunbar |
NB, Canada |
This was apparently sold as the Dunbar clapboard machine, first by Alex. Dunbar & Sons and, after the patent expired, by Maritime Foundry & Machine Works. |
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Gang saw
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Andrew Dunbar |
NB, Canada |
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Gang saw
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William Dunbar |
NB, Canada |
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Gang saw
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Alexander Dunbar Jr. |
NB, Canada |
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929,662
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Aug. 03, 1909
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Logging-engine
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Alexander Dunbar |
NB, Canada |
The primary innovation is a steam engine that can be leveled as it moves up or down a hill to avoid the water in the boiler from leaving tubes uncovered, which can damage the boiler.
An advertisement in the 1909-01-02 Canada Lumberman and Woodworker features this logging engine, made by Alex. Dunbar & Sons Co., Ltd. |