Sorry for any perceived snark, it was unintended.
Nice list, Iceberg.
It goes to show just how many brands and models receivers were once out there, when you consider that Toshiba didn't have/need a cross-reference and hence, doesn't even appear.
The Star Trak 8 listed, was an model upgrade from the Star Trak 6. For your premium price paid you upgraded to: UHF Remote; extra A/V outputs; enhanced audio; and buttons on the front panel!
The buttons may not seem like a big deal, but, as sturdy a performer as the Star Trak 6 was, it was totally bereft of them, making you entirely dependent on the remote control.
Both models used a lock and key at the rear of the receiver(top right when the receiver is facing you) to toggle between "run" and "program" modes.
Uniden had a model 500 series that was sandwiched by the 4000 series and the seemingly end-of- the-line Ultra/Supra series. In fact, the ultra seems to be a next generation SQ530, and the Supra a rough equivalent to the SQ560. It also seems that they didn't continue the SQ590 at all. That one was as loaded as they could make it then.
The entry level SQ530 had a large production run with coil problems(namely overheating, then failing due to being glued to the circuit board).
The upgrade to the Q560, yielded a UHF Remote, extra A/V outs, and event timers to move the dish for you.
The "Full Boat" SQ590, added more A/V outputs, A/V and composite inputs, more event timers, digital freeze, PIP, and selectable 4/9 screen scan.