Almost everything you've posted has probably taken you a long time to do.
What I would do, is go through your inventory, and write down the following information on each instrument:
1) Name of the MANUFACTURER
2) The MODEL NUMBER of each instrument.
You can share the data with us if you want to for our input, or to ask questions about particular units, but the
manufacturer name and model number will be enough for us to search on the internet, without having to post
a picture of each item.
As suggested, you will be able to sell a lot of this by listing the items on eBay or Craigslist.
One other thing: You mentioned something about a possible XRay machine. I wouldn't plug that in, as if it
is defective or was partially disassembled, radiation emissions could be dangerous (disregard that if what you
thought was an XRay machine was the Oscilliscope somebody already ID'd for you here).
Don't be worried about asking us anything about what you're finding there, we'll be happy to help answer
questions about them.