Shubham Jha - Class 11 & 12
Electron microscope was discovered in
Anonymous Quiz
1980
1950
1940
1920
⏤‌❱⋆⋆‌⃝🦋⃟'‌🇴ANAMIKA❱⋆⋆‌⃝🦋⃟'‌, 

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