An accessory apparatus for mobile radio telephones, particularly those used in cellular networks, permits utilization of the full communication range capability of a vehicle-mounted cellular radio telephone by a cordless portable handset remote from the vehicle. The apparatus includes a plug-in adapter...http://www.google.com/patents/US5422934?utm_source=gb-gplus-sharePatent US5422934 - Cordless range extension accessory apparatus for radio telephones
