u/dogreassuringlyabout

My dad was a land surveyor for many many years both for the state DOT but then had his own side business for farmers etc. He's been retired for a long time now (15 years? Idk for sure) and has all his old equipment in the garage. I've been encouraging my parents to get rid of it but have had no luck. Could anything still be used? Who could it go to? Who could I reach out to to ask? I was hoping if I had a plan in place maybe I could convince them....but I also have no clue what the things are or what they do, and what things are probably so outdated.