This industrial job-hopping culminated in 1917 when Mortimer was hired as a drill operator at the White Motor Company of Cleveland, Ohio, then a leading manufacturer of trucks and busses.
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During World War II Brockway manufactured G547 and G690 6 ton 6X6 bridging trucks, part of a standard design series also built by Corbitt and White.
The Cockshutt company was subsequently sold to the White Motor Company in 1961.