Schlumberger Electronic Transactions announced what may be the biggest deployment of smart card devices in North America: a deal to convert 50,000 coin-operated laundry machines over two years.

The French chip card company, which has U.S. headquarters in Moorestown, N.J., will install the smart card readers in 23 states in the Northeast, Midwest, and Southeast. The laundry machines are owned by Mac-Gray Corp. of Cambridge, Mass.

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