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The longer chain serves to transfer load more effectively to the polymer backbone by strengthening intermolecular interactions. This results in a very tough material, with the highest impact strength of any thermoplastic presently made. [2] UHMWPE is odorless, tasteless, and nontoxic. [3]
MTD Parts Modern Tool & Die, sometimes referred to as Michigan Tool & Die Company or MTD Products is an American manufacturer of outdoor power equipment for the mass market . Headquartered in Valley City, Ohio , the company began in 1932 and is a wholly-owned subsidiary of Stanley Black & Decker .
After the Great Depression, In 1928, Skil released the Model E Skilsaw, the first generation saw with a worm drive. In 1937, Edward Sterba built the first Model 77 with a 7 + 1 ⁄ 4-inch (180 mm) blade, considered the "workhorse on building sites". [6] The 75th anniversary of the Model 77 was in 2012.
Andreas Stihl designed and hand built his first chainsaw in 1926. [5] The saw was electrically powered, and weighed about 48 kg (106 lb). [6] Stihl grew slowly initially, as the chainsaws came to the market about the same time as the Great Depression; with manpower cheap, and old two-man saws proven, there was no need for power saws.
String trimmers powered by an internal combustion engine have the engine on the opposite end of the shaft from the cutting head, while electric string trimmers typically have an electric motor in the cutting head, but there are other arrangements, such as where the trimmer is connected to heavy machinery and powered by a hydraulic motor.
An electric trimmer. Electric hair clippers work in a similar way as manual ones, but are driven by an electric motor which makes the blades oscillate from side to side. [6] They have gradually displaced manual hair clippers in many countries. Three different motor types are used in clipper production: magnetic, rotary and pivot.
Wahl Clipper Corporation was founded due to Leo J. Wahl's patent for an electromagnetic hair clipper in 1919. [3] On February 2, 1921, he purchased a majority of the stock of his uncle's manufacturing company which made the clipper, and incorporated the business as Wahl Clipper Corporation. [4]
Chemically, chitin is a long-chain polymer of a N-acetylglucosamine, which is a derivative of glucose. The polymer bonds between the glucose units are β(1→4) links, the same as in cellulose . In its unmodified form, chitin is translucent, pliable, resilient and tough.
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