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Head of closing pin is covered with (i) Asbestos powder (ii) Slag Powder (iii) Asbestos powder than slag* (iv) None of above

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Head of closing pin is covered with (i) Asbestos powder (ii) Slag Powder (iii) Asbestos powder than slag* (iv) None of aboveove
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iii) Asbestos powder than slag*
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