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The Starrett corporation has continuously expanded through its history through the patenting of products and takeovers of other manufacturers. In 1878 Laroy S. Starrett invented and patented the first combination square, [4] and in 1880 he founded the L.S. Starrett Company in Athol, Massachusetts, in order to produce it and other precision ...
The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...
For example, a 1 ⁄ 4-inch to 3 ⁄ 8-inch adapter allows sockets with 1 ⁄ 4-inch drive holes to attach to a 3 ⁄ 8-inch ratchet, and so on. Universal joints are two articulated socket joints (about 1 inch (25 mm) long) combined at a right angle, that allow a bend in the turning axis of the wrench and socket.
A combination square is a multi-purpose measuring and marking tool used in metalworking, woodworking, and stonemasonry. It is composed of a rule and one or more interchangeable heads that can be attached to the rule. [1] [2] Other names for the tool include adjustable square, combo square, and sliding square.
A double-handled wrench for turning the dies used in threading operations (cutting the male threads such as on a bolt). specialty drum key lug wrench drum wrench: drum key: A small, square-head socket wrench used on drum (percussion musical instrument) tuning lugs and fasteners. This key is often interchangeable with radiator bleed keys. specialty
In 1990, the hand tool company was acquired by the brothers' Danaher Corporation. [4] This acquisition made the tools division the largest part of Danaher. [5] In 1991, Sears selected Danaher to be the exclusive supplier of Craftsman mechanic's tools. [6] In 2010, Danaher merged its tools division with Cooper Tools to form Apex Tool Group.
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