Neil McKie wrote:
  Of course you know the history of where the name TPL came from 
 ... don't you?

Ripped from the internet:

To compete with the MOTRAC, GE introduced what many consider to be the greatest flop in two-way radio history, the GE Transistorized Progress Line or TPL.  GE actually re-purchased many of the dysfunctional TPL's and supplied customers with the older tube-type Progress Lines that actually worked.  Only the later iteration of TPL's (without the quirky delay-line modulators) were viable but the damage to the GE name took many years to correct.
Thankfully, the MASTR-Pro and MASTR-II replaced the notorious TPL.









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