In 1959 Belleview Manufacturing introduced an electric winch. The company sold them (6000lb and 8000lb versions) through Warn Industries, since they manufactured other products for Warn also. However, based on the ad below, they may have marketed them to other resellers, since the ad doesn’t mention Warn at all.
The ad below was in the March 9, 1967, issue of the Sundance Times, a Wyoming newspaper. By the time the ad appeared, Warn had already purchased all the Belleview Manufacturing Stock, as the small caption below Thurston Warn’s photo indicates (which is on eBay). The next year, Thurston Warn became President of Warn.
Thurston Warn, VP and future President of Warn Industries.
Side note, here is a patent for a very recognizable Warn hub developed by Belleview/Warn in the summer of 1967. https://www.google.com/patents/US3442361