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Details of transmission systems, not covered by a single one of groups [CPC: H04B3/00] - [CPC: H04B13/00]; Details of transmission systems not characterised by the medium used for transmission {adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band where one band is the image frequency band of the other and the band selection is done by image rejection}