teaching people to speak and understand a foreign language

a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver

a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver

a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver

a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver

a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver

a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver

a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver

a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver

a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver