The Tool Known Formally As A 'Hex Key', Used To Turn Hexagonal Socket Screws, Is Most Commonly Known By What Name, After An American Company That Has Manufactured Them Since 1910?

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1. The Tool Known Formally As A 'Hex Key', Used To Turn Hexagonal Socket Screws, Is Most Commonly Known By What Name, After An American Company That Has Manufactured Them Since 1910?