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Classification of Rock Drills ( 21 ) DRILLS PLUG DRILLS LIGHT DRILLS FOR PLUGAND - FEATHER WORK BREAKERS NONROTATING Light , 30–40 lb Known as paving breakers and clas- Medium , 50–60 lb sified by wt Heavy , 80 lb HANDHELD MACHINES ...
( 6 ) By acetylene lamp , having a 3 - in round reflector , or a special reflector with a white enameled face made for this purpose . When using this light , no translucent screen is required , as the reflector gives a bright background ...
Mercury - vapor lamp is used on dc multiple circuits ; 110 volts with individual auxiliary starting and regulating device gives a blue green light , an effic of 15 to 20 lumens per watt and comes in units of 300 to 500 watts .
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LibraryThing ReviewUlasan Pengguna - wackyvorlon - LibraryThing
I only have the second volume of this work, and I love it! Found at a local Value Village, it is filled with fascinating information. Details of all aspects of mine engineering, including compressed air, ventilation, and supporting structures. Baca ulasan lengkap
Conditions Methods in General
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