operated by the operator to give the command 34 steam into the ascension pipe 34 on the same panel is a switch 24 which is operated upon the command 34 levelling completed 34 pressing button 23 is not effective until the machine has been positioned and the remaining conditions which permit injection of steam into the ascension pipe have been met by pushing button 23 an additional signal is generated by the local oscillator on the pusher machine 5 which signal is converted into a binary code and transmitted as a series of pulses after the other signals for commands and messages via the coils coil 50 and one of the coils 51 52 53 54 from the unit 83 the number of the chamber arrives in the form of octal numbers in the input buffers of the unit 82 which distinguish between selection and logic furthermore the command 34 steam into the ascension pipe 34 arrives from the locking system 81 via a line sv and the command 34 leveller coil selected 34 via a line lss the correct oven which has just been charged and must be kept under sub atmospheric pressure for a period is selected by decoders also included in unit 82 when the button 23 in the coke pusher machine 5 is pressed to give the command 34 steam 34 an electronic counter with an adjustable clock frequency in unit 84 starts working this counter directly operates a bistable flip flop circuit through which the appropriate one of the valve coils 31 32 33 34 is energised as long as the counter functions thus corresponding one of the air valves 131 132 and the corresponding one of the steam valves 141 142 are opened and steam is injected via the steam valve into the injector.