Welcome to the forum DB.
Google and
Ebay are your friends. You can try searching on there.
Best guess is that the two parts might have had something to do with an advanced
microwave communications setup of some kind back in the 70's.Could have been some kind or radar array. ?
If you knew something about the place that tossed them ... it might give you a clue as to what they were used for.
Either way, it's probably obsolete technology seeing as the parts are 40-50 years old ?
You might be cautious about selling. Some of the things listed on ebay were produced within the military industrial complex and may still be classified. Definitely don't sell anything you're not sure about outside of the U.S.
Edited to add:
You might try these guys if you would consider donating them to a museum..
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