General Knowledge :: Inventions
- In which decade were the first successful diode and triode vacuum tubes invented?
- Who is the English physicist responsible for the 'Big Bang Theory'?
- What 'game' was first produced by the Southern Novelty Company in Baltimore, Maryland in 1892?
- Which insurance salesman invented the fountain pen in 1884?
- What charge card, developed in 1950, was the first to be accepted nationally in the US?
- Which of the following was first patented by an Australian in 1889?
- Who among the following invented the small pox vaccine?
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