Spot on Roy
The Taycol motor does as you say have a website.(see end of post)
They are highly collectible.
Both the Unimite and the switch unit were both designed to work with the simple R/c gear of the time which was usually just an on/off function controlling a switch at the receiver. Early model planes used a clockwork Galloping Ghost mechanism to control the rudder by using an electromagnet controlled cam that gave ahead/left/ahead/right. You pressed the transmit button the required number of times to change direction.
The early radio sets did not have control sticks but just a button or two and often had a big box on the floor containing the battery connected to the hand held control unit. They did not have spot frequencies so usually could only be used one at a time. I built and used several (you had to buy a licence to use) and they did work but required constant retuning to maintain control. To increase the number of controls there were Tuned Reed units that vibrated and made a contact, to control a connected device, depending on the audio frequency selected at the Tx.
I would donate the bits to Colin H for his vintage display so others can see these vintage controls from the early days of Rc.
dave976
http://taycol.tk/Range.html