Heil Conveyor Like arch-rival Gar Wood, Heil built NYC conveyors under contract, but also patented their own version with unique dual side openings. This semi-trailer version was used by Milwaukee, Wisconsin, which was the firm's former home town. 8/2/04 © 2004 Eric Voytko All Rights Reserved Photos from factory brochures/advertisements except as noted Logos shown are the trademarks of respective manufacturers