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ALLOY X Back wave welding(Used for gas turbine engines,Testing a Lego-compatible Steel Axle - YouTube,Sd03c0540361449b7ae0cb683572af,育良精機 イクラ 100V交流アーク溶接機 IS-H40BF+低電圧溶接棒,Unimog U423 - Lego Technic 42177 Model B - YouTube