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More Mining Engineering Questions
In electric cap lamps, lead peroxide is used as . . . . . . . .
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'B'a's'e'd' 'o'n' 't'h'e' 'i'd'e'n't'i'f'i'e'd' 'h'a'z'a'r'd's',' 't'h'e' 'm'a'n'a'g'e'r' 'o'f' 'e'v'e'r'y' 'm'i'n'e' 's'h'a'l'l' 'p'r'e'p'a'r'e' 'a'n' 'a'u'd'i't'a'b'l'e' 'd'o'c'u'm'e'n't's' 'c'a'l'l'e'd' '.' '.' '.' '.' '.' '.' '.' '.'