Where were wigs first invented?
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What George Westinghouse invented?
What charge card, developed in 1950, was the first to be approved nationally in the US?
The card was established by Frank McNamara and Ralph Schneider.
When were bar code scanners invented?
Who invented Gramophone?
The first gasoline-run car engine was developed by
Stethoscope was invented by
In which year was the first solid state integrated circuit demonstrated?
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