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Just wondering if anyone knows what these are? I can't find identification on the units. I looked through some google image search but still having trouble. I'm selling the pair for $50. Not a single bite yet. Do you think that's a fair price?

Glad I'm now part of it. I originally came to here to ask a question because I saw something similiar in a google search and now I'm finding all kinds of gems. I'm helping my dad unload a lot of his "stuff" which is mostly air powered equipment and he ran two different air businesses over 40...