T Tina Singh 🎓 Tutor II ⭐ 13.16K Points 📊 Computer Q. Vacuum Tube का आविष्कार कब हुआ था? (A) 1900 (B) 1904 (C) 1910 (D) 1880 👁️ Show Answer 🔗 Share ⚡Menu ✅ Correct Answer: (B) 1904 You must be Logged in to update hint/solution 💬 Discussion 💬 Comment