(plural tractor beams)
Probably a shortening of "Attractor beam".
"tractor-beam." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/tractor-beam>.
tractor-beam. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/tractor-beam
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