Many people starting new businesses today are too young to even remember the days of the old-school credit card imprinter—you know, that clunky plastic device that made a carbon print of a credit card ...

Thanks to those magnetic strips on the back of credit cards, you can pay for gas at the pump or buy groceries at the checkout with one quick swipe through a card reader. No more clunky manual card ...

Discover the history and function of knuckle-busters, manual devices once essential for recording credit card transactions, and how they compare to modern solutions.