Teletype Corp. motors

I found a small pile of boxed NOS Teletype corp. motors in a junk store earlier: small, p/n 177870 (115VAC, 3250rpm at 60Hz) small w/reduction gearbox, p/n 193958 (115VAC, 110rpm at 60Hz) medium, p/n 319392 (115VAC, 1725rpm at 60Hz) medium dual-shaft, p/n 337286 (115VAC, 3600rpm at 60Hz) medium with frame, capacitor & thermal reset, "28F motor unit" (3600rpm at 60Hz) medium dual-shaft, p/n 195801 (115V, 3600rpm at 60Hz) large, p/n 159739, marked as "unit motor 28C" There are a few dates which place them around the late 1960's / early 1970's. There's a wiring diagram in with the "28F motor unit" which claims to be for "CXB-1 and MU43 motor unit". Any ideas what equipment they were for? Model 28 machine, perhaps, given the 28C and 28F references... cheers Jules