Lamarr and Anthiel received a patent in 1941, but the enormous significance of their invention was not realized until decades later. It was first implemented on naval ships during the Cuban Missile Crisis and subsequently emerged in numerous military applications.
Cash back credit card reward programs started out rather simply, offering a flat percentage rate (typically 1 percent of purchases) rebated back to the customer in the form of a check at the end of the year or a statement credit.
Earn cash back rewards when you buy the things you need. by Mike Jelinek Updated on 08.05.16. The best cash back credit cards can help you earn money for purchases you make every day. With cash back cards, you earn a certain percentage of cash back on all purchases you make with the card. That percentage can be very large in certain categories, like groceries, gas, entertainment, Amazon purchases, and more.