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Motorola did not, and was involved in litigation with Armstrong and Armstrong's widow (who eventually prevailed) well into the 1960's.The initial GE-made mass production model FM mobile employed GE's E-1-A and E-1-B, which were large separate transmitter and receiver units, similar in physical design to Link equipment.
The equipment was available only in the 30-40 MHz range. The two-way radio industry then began calling the equipment which immediately preceded the "Progress Line" the "Pre-Progress Line," and even GE began to refer to it as such by the early 1960's.Link and Daniel Noble for the Connecticut State Police proved its superiority over the older low frequency one-way AM broadcasts and AM in general.From that point on, all major manufacturers switched emphasis to VHF FM products and generally introduced no new-design AM equipment from that point onward. This is not to say that AM equipment was not still being sold, just that purchasers were still buying models and designs dating from 1940, more or less.One reason the units remained separate, other than weight and size constraints, is that purchasers often wanted to add only a transmitter to an already existing medium wave AM receiver installation in an automobile (California Highway Patrol, for example.) It should also be noted that within months of completion of the Link system for Connecticut, Noble had joined Motorola, Inc. O." equipment designation was, other than that it was the first equipment actually manufactured by GE, at their Bridgeport facility, beginning in 1941.and Motorola was producing a two piece VHF FM radio of their own called the "Deluxe" line, which not surprisingly, appeared very similar to the Link 1940 FM equipment. using designs created by GE engineers in Schenectady, N. That equipment is believed to be the E-1 Series shown below.