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Robertson screw

/ˈrɒbətsən/
noun
1.
trademark a screw having a square hole in the head into which a screwdriver with a square point (Robertson screwdriver (trademark)) fits
Word Origin
C20: after its inventor P. L. Robertson (1896–1951), a Canadian industrialist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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