Supervisory control system for selectively connecting recorders and transcribing stations

Claim 1

In a supervisory electrical system including first and second series of stations each having a predetermined number of interstation connector lines leading therefrom: a selector switch mechanism comprising a multipole, multiposition switch for each station of said first series, said switch having a line pole connected to each of said interstation lines, a control circuit pole, a ground selector pole and an on-off grounding pole, and each of said poles of said switch having an off position and as many active contact positions as the number of stations in said second series, lead lines connecting the active contacts of each line pole to the corresponding interstation lines of said respective stations of said second series, a control circuit having a relay for each of said switches, each of said relays having a set of normally closed contacts in Each of a predetermined number of said interstation lines of the station of said first series corresponding to the respective switch, a lead line connection from each active contact of said control circuit pole of each of said switches to the corresponding active contact of the ground selector pole of each remaining one of said switches, and a ground circuit connection to each ground selector pole serially including a set of normally closed contacts of the relay of the respective switch and said grounding pole of the same switch whereby upon shifting one of said switches to a preselected position to connect one of the stations of said first series to one of the stations of said second series already connected to another station of said first series the relay corresponding to said one switch is operated to open the preselected number of said interstation connector lines of the station corresponding to said one switch.