A copolymer containing a repeating unit of formula and a repeating unit of formula or :wherein R1 and R2 represent alkyl or aryl, R3 represents alkyl, aryl, alkoxy or amino, R5 and R6 represent hydrogen, alkyl or aryl. The other connecting port is removably attachable to a pressurized air source. When the member of a certain control module is in a selected position, an actuator of a corresponding one of the well tool assemblies is placed in fluid communication with a flowpath connected to the control module. The device further comprises a motor unit engaged with the second housing. The drive from the coaxial output shafts is selectively connectable to an offset system output shaft by means of high-and low-regime clutches arranged coaxially with the system output shaft. The input signal INDATA is encoded in such a manner that the logic level of the transmission signal transmitted through at least one of the two signal transmission lines is changed in any two consecutive elementary periods.