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… everywhere around us. There are approximately 1 million propane storage tanks and 14 million refillable cylinders in … pressure. The most common pressure liquefied gas in use is propane. At 20°C propane is maintained as a liquid as a result of being under …
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… 104. Hand Operated Switches General (a) Operation of Switches - semi-automatic, spring, dual control or … switches apply. (b) Except while being turned, each switch must be secured with an approved device. When a switch has been turned, the points must be examined and the …
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