Cornell-Dubilier (North Carolina, Cleveland) sold some of the first consumer TV rotators in the early 1950s.Alliance Manufacturing, based in Alliance, OH was a competitor in TV rotator market.
The Radiart rotors eventually became part of the Cornell-Dubilier Electronics (C.D.E) division.
The 1950s Radiart/CDR rotors (TR-2, TR-4) were FIRST generation designs -- NO braking included.
Radiart Corporation TR-2 Service Bulletin (rare 1954-1957 copy)https://www.msu.edu/~yurkon/Documents/radiart.pdf
The CDE HAM series, introduced in 1957, added an early brake design for amateur radio owners.
This was improved upon in subsequent versions of the HAM series (see below).http://victrolla.homeip.net/wo5s/junkpile/cde/ham-m/ham-m.pdf
Cornell Dubilier Electronics sold their rotor division to Telex/Hy-Gain in 1981.
Hy-Gain based in Lincoln, NE decided to support only the AR-22, AR-40, CD45-II, Ham-4, and Tailtwister rotors.
All rights to the other rotors were assigned to Norm's Rotor Service -
that includes CDE documentation or parts for your CDE TR-2 rotor.
Norm's Rotors Service is the only facility with parts for the original units.
Norm's have almost all parts for the AR-22, AR-33, AR-40, AR-50,
BT-1, TR-44, CD-44, Ham-M, Ham-2, and Ham-3 rotors.
Telex/HyGain sold the HyGain line of rotors to MFJ in May of 1999 --
who still continues to manufacture HyGain rotors from their Mississippi facility.
Norm's Rotor Service or http://www.rotorservice.com/index.htm
CATS (Rotor Doctor) are your best source for ANY documentation and parts from 60 years ago.http://www.rotor-doc.com/
Frequently Asked Questions about USA manufactured rotators (Cornell-Dubilier, Alliance)http://www.rotorservice.com/faqs.htm