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Inventions

Inventions
In which decade were the first successful diode and triode vacuum tubes invented?

1900s
1880s
1890s
1800s

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Inventions
Which insurance salesman invented the fountain pen in 1884?

George Fountain
Charles Kettering
Lewis Edson Waterman
Sir William Grove

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Inventions
In which decade was the first solid state integrated circuit demonstrated?

1970s
1950s
1980s
1960s

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Inventions
Who synthesized the first wholly artificial gene?

J.J. Thompson
Meghnad Saha
Benjamin Franklin
Hargobind Khorana

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Inventions
When was the toothbrush invented?

1742
1790
1765
1770

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Inventions
When was the first Lionel trains manufactured?

1890
1920
1901
1944

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