<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2737.800" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV>The legend goes like this: Sometime around  the turn of = the century, Peter Lymburner Robertson was setting up a street = booth from which he planned to sell tools, when the  = slot-headed screwdriver he was using slipped out of the screw head and = slashed open his hand. "There must be a better way," he mumbled to = himself before vowing then and there, the story goes, to create the = ultimate driver. P. L. Robertson did  indeed patent his = square-headed driver and screw system in 1908. And not = long after, the Fisher Body Company (famous for constructing the = Ford Model T) decided to use his invention in its production line. Robertson's colour-coded = screwdrivers ( yellow, green, red and black from smallest to largest) -and square-headed screws have grown to dominate the Canadian = fastening market: Fully 85% of the screws sold in Canada use the = Robertson head. About 10% of the screws sold in the U.S. are Robertson and This Old House and New  Yankee Workshop = guru Norm Abram suggests they could dominate  the industry in 15 years. </DIV></BODY></HTML>