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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.
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The crucial step toward interchangeability in metal parts was taken by Simeon North, working only a few miles from Eli Terry. North created one of the world's first true milling machines to do metal shaping that had been done by hand with a file. Diana Muir believes that North's milling machine was online around 1816. [20]
Internal combustions engines require lubrication in operation that moving parts slide smoothly over each other. Insufficient lubrication subjects the parts of the engine to metal-to-metal contact, friction, heat build-up, rapid wear often culminating in parts becoming friction welded together e.g. pistons in their cylinders.
Labor costs were previously reported to have advanced at a 2.4% rate in the April-June quarter. They increased at a 2.2% pace in the third quarter from a year ago, revised down from the previously ...
Few things will put a damper on your vacation or holiday faster than food poisoning.The intense stomach pain, rushing to the toilet and feeling relegated to bed keeps just about everyone out of ...
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