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

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

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1) This statesman, politican, scholar, inventor, and one of early presidents of USA invented the swivel chair, the spherical sundial, the moldboard plow, and the cipher wheel.

2) What invention caused many deaths while testing it?

3) Until Victorian times, chocolate was thought of as a drink. When did the first chocolate bar appear?

4) What Galileo invented?

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