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... maser , device for creation, amplification, and transmission of an intense, highly focused beam of high-frequency radio waves. The name maser is an acronym for m icrowave a mplification by s timulated e mission of r adiation, microwaves being radio waves of short wavelength, or high frequency... Masers have been developed to operate at many different wavelengths, so that the original designation "microwave" is no longer strictly accurate.
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