It is an RF Power Amp designed for what looks like UHF Strip Line elements, with two Pairs, of two Transistors in the Final Stage, combined by Impedance Matching strip line elements, and driven from a single Transistor, that looks to be setup for Linear Operation in with Bias'ed Base Drive.
It has relays in the RF Path on both Input and Output connectors that allow for the Amp to be switched in and out for TX/RX, and looks to have an RF Sensing system on the Input, to switch it from RX to TX Modes. Can't tell the Input DC Voltage, but the Fuse (F2) looks to be less than 5 Amps and that would limit the RF Output to under 100 Watts, most likely. This is not a HAM type Amp but looks to be way over-built for the commercial Market.
RF Input and Output Connectors are N Type, and this also points to a UHF Amp, and most VHF Power Amps would be using SO-239 Connectors. Twin Cooling Fans blowing Air across the unseen Heatsink, also denotes a way over-built unit, as most Ham type units will no have such fans but would use Convection Cooling. Also notice that the only tuning used is on the Driver Stage, Input, Output, and coupling to the Final Stage Input Power Splitter Impedance Matching Network. so the Gain of the Final Stage is fairly LOW, as the Output is Designed to be very wide band. Just Say'en... YMMV...