e communication systemUS4989230 *23 Sep 198829 Jan 1991Motorola, Inc.Cellular cordless telephoneUS5022068 *2 Mar 19884 Jun 1991Nec CorporationBranched telephone systemUS5157660 *21 Sep 199020 Oct 1992Hitachi, Ltd.Communication system including portable terminals and fixed terminalsUS5247565 *21 Oct 199121 Sep 1993Motorola, Inc.Cellular telephone with keypad controllerUS5259018 *5 Aug 19922 Nov 199