71. The washers used in flame safety lamp made of . . . . . . . .
72. Drying agent in self rescuer is . . . . . . . .
73. Number of dry cells provided in GL-60 flame safety lamp.
74. The inorganic dust producting the diseases are classified into . . . . . . . . groups.
75. It is the average candle of power of lamp in all directions.
76. Number of cylindrical glasses in GL-60 flame safety lamp.
77. Find the formule for HP assistance due to NVP.
78. The persons worst subjected dust hezard in coal mines are . . . . . . . . .
79. The wire gauze shall have the total heat radiation area of not less than . . . . . . . . cm2.
80. Konimeter measures the dust concentrtion in terms of . . . . . . . .
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