R Ram Sharma 🎓 Coach ⭐ 193.88K Points 📊 General Awareness Q. Electron microscope was invented by (A) Robert Koch (B) C.P. Swanson (C) Knoll & Ruska (D) Leeuwenhock 👁️ Show Answer 🔗 Share ⚡Menu ✅ Correct Answer: (C) Knoll & Ruska You must be Logged in to update hint/solution 💬 Discussion 💬 Comment