Electric typewriters are steadily taking a bigger share of the typewriter market, but none of them can match the unusual trick of the new Smith-Corona portable, introduced last week; it can keep right on typing after its cord is pulled out of the socket. The source of its cordless energy is a compact, efficient power supply that has excited the inventive brain of U.S. industry: the nickel-cadmium battery. This versatile product can be recharged in an ordinary electric socket, can be made tiny enough to power a hearing aid, and is good...
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