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Charles:
I believe that last number of the model numbers were just arbitrary numbers given to denote slightly different cabinet styles. The 17T13 may have been a mid-year replacement for the 17T3 that could of had some design changes either cabinetwise or circuitwise.
I have many of the early Moto brochures including 1951 and much of their factory service info. What 1951 models are you looking for specifically?
Steve
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