General Science · Inventions and Discoveries
अलेक्जेंडर पार्क्स ने पार्केसिन (प्रारंभिक सेलुलाइड) नामक प्लास्टिक सामग्री के लिए अपना पहला पेटेंट किस वर्ष प्राप्त किया था?
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