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CBS didn't just make 15GP22. They one upped RCA and figured out how to deposit phosphor onto the inside of the face of the envelope (without reducing the ability to obtain good purity and convergence) and came out with a 19" version of the 15GP22 the IIRC 19VP22... Motorola, CBS, Westinghouse and others actually made sets with the 19V.
RCA was so ticked off their $6M invest in CRT tech was obsolete that they bought the patent from CBS them came out with the 21AXP22 to obsolete the CBS tube... During the time the 19V was the best tube on the market RCA refused to modify the CT-100 (it would have only been cabinet modifications) to use the 19V and because of that waiting and customer frustration with their current product being essentially obsolete. They had to basically hack together the 21CT55 to take the 21AXP22 as a stop gap till the CTC-4 was ready.
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