In 1906, Mark Honeywell founded the Honeywell Heating Specialty Company in Wabash, Indiana, to manufacture and market his invention, the mercury seal generator. The company expanded in the states during the 20s and overseas in the 30s with a hiatus during WW2 when, as almost all manufacturers became part of the defense industry.
After WW2, while returning to civilian products, they also kept a military division dedicated to aviation and aerospace.
Below is a brochure from 1950.
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