This statesman, politican, scholar, inventor, and one of early presidents of USA

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.

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1) What furniture item was invented by California furniture designer Charles Prior Hall in 1968?

2) Which insurance salesman invented the fountain pen in 1884?

3) Who had an explosive idea and first patented DYNAMITE?

4) Who invented Electric Generator?

5) In which decade was the telephone invented?