This was a constant linear speed machine. There was no turntable motor. There was a small motor and rubber wheel in the arm which drove the turntable. The speed would constantly change from the outside to the inside. I'm not sure if they ever published the specs. They would never expect they would be played back on anything but their own machines.
"Constant linear speed machines" have, AFAIK, never done much except generate phonorecords which cannot be usefully played except on their own specific brand of machines! I have one of the UK make (forget its name) of the twenties...and playing it on a normal 78 machine is an odd... but useless from a listening standpoint...experience...?!