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Back in the day, there was a mounting bracket that allowed you to simply pull the radio out of the car without unhooking any wires or coax.
All connections from the radio were made to the slide out part then power and coax were connected to the mounted part.
That item is what allowed to to remove the radio from your car and use it for a base station. It's nothing more than a low amp power supply and a coax jumper in a box, some even had a speaker.
Edit 2: I looked up the patent number on the mount. "A slide mount for removably supporting a citizen'band (CB) radio or similar electronic equipment in a vehicle, or the like, or any other mounting surface, including a base attached to the vehicle and a slide attached to the CB radio and a quick disconnect structure for mechanically engaging the slide with the base and releasably latching the slide in position and also providing quick disconnect pin and socket-type connections between antenna circuits and electrical circuits so that the CB radio may be easily installed and removed with the installation and removal automatically coupling all of the components to the radio so that it may be operated immediately upon completion of the slide connection. A longitudinally movable release plate is provided on the slide to release a spring tab or lug engaged with a detent on the base so that outward longitudinal force exerted on the release plate at the end of the slide facing the operator of the radio will readily release the slide for removing the radio and slide assembly. The pin and socket contact assemblies are arranged so that the antenna and other pin and socket connections are completed prior to the completion of the power and ground pins and sockets in order to prevent any possibility of damage to the equipment resulting from being placed under power with either the antenna or speaker circuits disconnected. The structural interconnection between the slide and base is such that the slide can be readily aligned with the base and a tapered structure is provided so that when the slide is completely installed, very little play exists between the slide and base."
That makes sense. Most of us are familiar with the mobile-only sliding/locking radio quick disconnect assemblies. They were very popular in the 70's. Never seen one like this though. And of course the ebay seller has no idea which is why they didn't describe it any better.
It's a power supply pack. They use to make mobile brackets that allow a person to take their CB radio in and out of the car. This power supply mates up with the bracket that is installed on the radio so a person can use their radio in the house. No need to unscrew the coax or unplug the power cord.
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