P. L. Robertson

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Peter Lymburner Robertson (1879–1951) was a Canadian inventor of the square-drive Robertson screw, first produced in his Milton, Ontario factory in 1908. Robertson also wrote The Gold Standard, a book advocating gold-backed money.

The Robertson factory is still operating today.

He also received the Canadian patent for his invention.

More information can be found in the books "P.L. Inventor of the Robertson Screw" by Ken Lamb, and "Milton Area Biographies V.2."

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