Looks like RF stuff to me.... perhaps RF power transistors mounted on the PCB?
Ooh, actually, at the bottom, it mentions a RF power transistor
Its very unlikely you'll find out what these boards were for... if they have silk screen component printing on them, then you could knock up a crude schematic to show you which parts connect to which, if there is no silk screen, then its almost impossible to 'guess' by PCB footprints alone. Looks like surplus prototype PCB's....perhaps for RF (it its double sided and has LOTS of via's, and a ground plane, its likely to be high frequency.
But, seeing as how you got it in a lot, you could always just cut the PCB up for 'adapters', if there are SMT footprints on there, which are borken out to larger traces for wires.
Apologies for going out on limb about 'mainline electronics'..its jstu they were selling off populated PCB's, and I've been stripping them and researching all the parts lol
Good luck, and I'm sure those will find a happy place in your 'bits box' - I have a 'bits mountain'
Edit: the part number markings on the PCB rarely help in any way. They are usually jst a serial number system by the manufacturer for repairs/paperwork and the informaiton on them in rarely published on the web as there is no need...