Warning to bleary-eyed traveling executives: that gadget you thought was your electric shaver could be making a copy of your chin. Meet the incredible shrinking copy machine. The new, hand-held devices, priced from $250 to $350, are arriving from Japan and slipping into briefcases and little market niches , in the U.S. The battery-powered machines, when moved slowly down a newspaper column or across a passage in a book, can instantly produce a copy on a strip of paper about 1 3/4-in. to 3 1/4-in. wide. They use miniaturized thermal technology to transfer images onto the special heat-sensitive paper, which costs...
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