(plural tractor beams)
Probably a shortening of "Attractor beam".
"tractor-beam." YourDictionary, n.d. Web. 17 September 2018. <http://www.yourdictionary.com/tractor-beam>.
tractor-beam. (n.d.). Retrieved September 17th, 2018, from http://www.yourdictionary.com/tractor-beam
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