Credit cards that hide the account number and store multiple accounts

If you’re anything like me, there’s a stack of credit cards bulking up the size of your wallet (or purse), making it fit to burst in a Costanza-like explosion of receipts and unused condoms. New technology from Pittsburgh, Pennsylvania startup Dynamics Inc. could help cut the number of cards cluttering up your wallet by allowing you to access multiple credit card accounts on a single card. To enhance security, the technology also allows the credit card number that appears on the front of a card to be hidden until the correct code is entered.

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