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

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

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3) What Enrico Fermi invented?

4) For over 500 years, paper was only available and sold as single sheets. In 1902, an inventive Australian used half size sheets of paper, a bit of glue and cardboard to create the what?

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