An undated (c. 1932-34?) Sargent brochure for hydraulic plows says they had been building plows 14 years and were the first tractor snowplow. I admit being skeptical as others like Good Roads, Baker and Root had been building plows a long time.
A Aug. 1927 price list gives delivery prices from both Bangor and Portland, a c. 1928 Sargent brochure covering both wood and steel, horse and mechanical plows gives the manufacturer name as Union Ironworks Inc. Bangor, ME
I didn't find the 1923 patent referred to in one brochure as the first, but I did find one in 1925 issued to Donald A. Sargent of Bangor, assigned to Northern Trailer Co. of same, for patent on HYDRAULIC nose wings and nose gear to lift snowplow for travelling (while not in use). Linn, Frink and others were still mechanical at this point. D.A. Sargent assigned a over-the-cab scoop design and v-plow improvements patented 1932-34 to Maine Steel Products Co. of Portland. 1932-33 John B. Woodbury & George C. Soule assigned plow improvements to them as well (probably employees), as did Carle D. Henry 1936-37. Linn began selling Sargent plows with their tractors because they had pioneered hydraulics, but the wing tips had to be beefed up and v-plow height increased to satisfy H.H. Linn. Linn of course was a native of Maine and travelled back and forth frequently between sales agencies and factories. That said, the switch to Frink once they also had hydraulics (late 1930's), was based on delivery issues/steel shortages that Sargent was experiencing c. 1940, according to salesman notes I have run across where towns willing to pay more for Sargent plows just couldn't get them. The easy to spot characteristic of the Sargent plows is the vertical posts are I-beam.

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