Question:
In which decade were the first successful diode and triode vacuum tubes invented?
Answer:
1900s
Question:
Which country invented the Time Recorder?
Answer:
Egypt
Question:
Who invented the Pencil?
Answer:
Nicolas Jacques Conte
Question:
Who invented the first submarine?
Answer:
Cornelius Drebbel
Question:
Which is the invention year of Microscope?
Answer:
1590
