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Torx ttap is a version of Torx that reduces wobbling between the fastener and the tool, and is backward compatible with standard hexalobular tools. [ 47 ] [ 48 ] As early as 2005, the German screw manufacturer Altenloh, Brinck & Co introduced a similar driver design under the trade name Spax T-Star plus .
In 1992, Black & Decker began a major effort to rebrand its professional quality and high-end power tools to DeWalt. In 1994, DeWalt took over the German woodworking power tool producer ELU, and used ELU's technology to expand their tool line. As of 2001, they manufacture and sell more than 200 hand power tools and 800 accessories. [2]
Both the tool and socket have a slight taper. The contemporary square drive screw has all but replaced the Robertson screw proper and is commonly referred to as a Robertson because it has practically identical drive dimensions and the same colour identification system, but the contemporary square drive socket has parallel sides rather than tapered.
Screwfix Direct Limited, trading as Screwfix, is a retailer of trade tools, accessories and hardware products based in the United Kingdom. [6] Founded in 1979 as the Woodscrew Supply Company, the company was acquired in July 1999 by Kingfisher plc, which also owns B&Q, and is listed on the London Stock Exchange.
The first patented spiral push drill or similar spiral screwdriver dates back to 1868 known as the Allard's patent, but since we have never been able to find one in existence, we assume that the 1868 patent was never manufactured in quantity. The earliest we have observed is the F. A. Howard patent, known to have sold in the US in quantity.
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