Robertson screw
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English
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Robertson_screw.jpg/220px-Robertson_screw.jpg)
Etymology
[edit]From Canadian inventor P. L. Robertson (1879-1951).
Noun
[edit]Robertson screw (plural Robertson screws)
From Canadian inventor P. L. Robertson (1879-1951).
Robertson screw (plural Robertson screws)