Lot of 4 NIMLOK Tradeshow? Display Stem Light Lamp MTSA-1210 w/ Osram 50w Bulb

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Lot of 4 NIMLOK Tradeshow? Display Stem Light Lamp MTSA-1210 w/ Osram 50w Halogen? Bulb
As you can see by the question marks, I don't know anything about these. There's one in the picture, you're getting 4.
I saw another listing on here for Nimlok lamps and they were listed as trade show lights, so, I'm guessing these are as well. There are no power cords included.
It looks like they were designed to mount onto a track or something.