The story
From Canadian inventor P. L. Robertson (1879-1951).
Etymology from Wiktionary, CC BY-SA 4.0.
Robertson screw
Today it means: A type of screw having a square recess in the head. Full definition →
Today it means: A type of screw having a square recess in the head. Full definition →
From Canadian inventor P. L. Robertson (1879-1951).
Etymology from Wiktionary, CC BY-SA 4.0.