Back in the 1920, 30s, 40s there were allot of independent elevator companies in the Midwest. Kiekhaefer & Heller were the two big ones. They usually bough CJ Anderson controller, sometime Cutler Hammer. They used GAL interlocks and St Louis Door Company tracks. I'm however stumped on a job I was just at. It has a pickup roller very similar to GAL but is using a convex door track roller similar to Armour's in a "J" style track. Anyone have a clue who this door equipment might be from? Sorry the pick of the roller and track didn't turn out.