... 21-E1B CURRENT SERIESTransmitter and Receiver21-E1B is one of the most useful and cognition industry remote controller in ... chain electric hoist, monospar, double girder, tower crane, gantry type of jib crane and other multifunction industrial devices.The used sites are ... and automatic control system etc devices, expand the action space of the operator.The product is small volume, more accurate, ...