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) When were bar code scanners invented?

2) Who among the following invented the small pox vaccine?

3) What Thomas Davenport invented?

4) What now-ubiquitous device was invented by Zenith engineer Eugene Polley in 1955?

5) In which decade was the telephone invented?