when was explosives invented
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when was explosives invented
when were explosives invented
who invented explosives
when were plastic explosives invented
when was plastic explosives invented
who invented plastic explosives
when were the first explosives invented
who invented the first explosives
when was explosives invented, when were explosives invented, who invented explosives, when were plastic explosives invented, when was plastic explosives invented, who invented plastic explosives, when were the first explosives invented, who invented the first explosives