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I Q to R-Y Q
There is a tiny note with a plethora of patent holders pasted to every CT-100 cabinet. I'd guess it is in 2-point type! or so. AT&T, Farnsworth, GE, Hazeltine, N.V. Philips, Philco, Westinghouse, and it says "others"...
So it is likely patent payment may well have been a factor.
To decode the R-Y signal, the quadrature transformer changes from a TRV365T in the CT-100 to a TRV-370T in the 21-CT-55.
Pete
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