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Publication of GB400257ApublicationCriticalpatent/GB400257A/en
H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
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GB11574/32A1931-05-021932-04-22An apparatus adapted to produce electric fields of high frequency having multiple wave lengths
ExpiredGB400257A
(en)