another electronic device
You might be able to use some of the chips (if that's what you're after).
There's: CTC (Clock/Timer Controller), USART (Universal Serial Asynchronous Receiver/Transmitter), PIO (Parallel Input/Output), SRAM (Static Random Access Memory), A/D-C (Analog to Digital Converter) and D/A-C (Digital to Analog Converter). All seems to be socketed, so are easy to remove.
The TTL ICs (74-series) simply ain't worth spending time desoldering.
The board in your previous post has got a voltage regulator, a few power transistors and the two grey uneven cylinder shapes on top left are coils with ferrite cores (rewindable). If you're hard pressed for components, perhaps grab the electrolytic caps, the round blue shapes with crosses are trimming resistors and then there's the 8 small signal transistors, but personally, I wouldn't bother.
Desolder what you need right now or is easy to get and stove the rest in a box for future ripping - Chances are you won't ever use most of it.