05-21-2024, 08:06 AM
The patent licensing notice has no relationship to who manufactured the radio. I don't see a model 40X in the Universal Schematic Locator or in the CD-ROM edition of Bunis. It isn't one of the 1939 RCA series which begins "40X" followed by two digits.
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/