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#2 How to learn Most Imp. Inventions and Inventors in Hindi | खोज / आविष्कार|150+ | #2/5 – tricks

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#1 How to learn Most Imp. Inventions and Inventors in Hindi | खोज / आविष्कार |150+ | #1/5 – tricks

Trick – electron proton neotron ke kojkarta(खोजकर्ता)|Discoverer of Electron,proton,neutron in Hindi