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7 results returnedOfficial changes in the active list of permissible explosives and blasting devices for October, 1930
Official changes in the active list of permissible explosives and blasting devices for March, 1931
Official changes in the active list of permissible explosives and blasting devices for April, 1931
Official changes in the active list of permissible explosives and blasting devices for January, 1931
Official changes in the active list of permissible explosives and blasting devices for August, 1930
Official changes in the active list of permissible explosives and blasting devices for June, 1931
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