 The lifting frame was fitted with outlet sockets and wiring for field telephones.A main connection from the armoured launch vehicle switchboard to inlet sockets on the lifting frame provided circuits for four field phone stations at the Meillerwagen – one each at the upper and lower folding work platforms and two at the launch table.An early configuration of the "Meillerwagen" included hard-wiring of two electrical power circuits and two "FLAK"-plug circuits for the power and control needs of the rocket.