Citations de brevets Brevet cit??? Date de d???p???t Date de publication D???posant TitreUS5157660 *21 sept. 199020 oct. 1992Hitachi, Ltd.Communication system including portable terminals and fixed terminalsUS5168498 *3 mai 19901 d???c. 1992British Telecommunications Public Limited CompanyMobile communications systemUS5274694 *19 d???c. 199028 d???c. 1993Siemens AktiengesellschaftRadio communicati