What charge card, developed in 1950, was the first to be accepted nationally in

What charge card, developed in 1950, was the first to be accepted nationally in the US?

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1) Where was the yo-yo invented?

2) What plaything was invented by Joe McVicker in 1956?

3) 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.

4) What Igor Sikorsky invented?

5) For what does the world owe Almon Strowger a debt of gratitude?