General Knowledge · Inventions and Discoveries
1836 में अमेरिका में पहले व्यावसायिक रूप से सफल घूमने वाले सिलेंडर वाले आग्नेयास्त्र (रिवॉल्वर) का आविष्कार और पेटेंट किसने किया था?
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