 The Union Manufacturing Company came into existence at around the close of the Civil War. Made up largely of the Board of Directors of Stanley, the ownership and stock holders started the new company just down the street from The Stanley Works in New Britain, CT |  |  In June 1904, John Carlton and George Trask, Union employees, were granted a patent for a blade adjusting system that employed two round brass knobs mounted on a threaded vertical shaft that, when screwed up or down the shaft, would increase/decrease blade exposure below the plane's bottom. (Basic depth adjusting) |  The planes were given the moniker, X No. #. They came in sizes X-0 (Stanley No 1 equivalent) through X-8 including a fractional X-4a (4 1/2) and X-5a (5 1/2). There was no X-1 produced as is currently believed. The X planes also came configured as a series of transitional planes. |
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