NEW PRODUCTS: Calculated Warfare

Since they were first introduced 14 months ago as a kind of executive toy, pocket calculators have amazed their own inventors by appealing to a wide range of consumers, including many whose most pressing known mathematical need is the totaling of bridge scores. Originally marketed mostly by office-equipment firms, the electronic gadgets are now found in countless department stores, photo marts, gift shops and other mass retail outlets. No fewer than 50 U.S. firms have started making mini-calculators, which perform the four standard mathematical functions instantaneously, yet are small enough to...

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