Turnbull
Turnbull was an elevator company from Canada that was bought out by Dover. I've never seen one of these elevators out in the field, but I have worked on some Turnbull fixtures.
Call Button with Roto Dial
This is a Turnbull elevator hall call station that has the roto dials. In this video, I show you in detail the fixtures and roto dials as well as wiring the buttons up.