when were explosives made
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when were explosives made, when was the first explosive invented, first explosive ever made, when were plastic explosives invented, who made the first explosive, history of high explosives, who created the first explosive, history of explosives in mining, history of explosive weapons, what was the first explosive, when were explosive mines invented, boom the history of explosives, when were explosions invented, when were explosive bullets invented, information about the explosives, who invented plastic explosives, introduction to the technology of explosives, interesting facts about explosives