Compulsory tour signalling system for watchmen

Claim 1

A COMPULSORY TOUR SIGNALLING SYSTEM FOR WATCHMEN COMPRISING A PLURALITY OF NONWIRED STATIONS, A WIRED TRANSMITTER STATION, EACH NONWIRED STATION ARRANGED TO BE VISITED BY A WATCHMAN IN ACCORDANCE WITH A PREDETERMINED ROUTE PATTERN BEFORE A SIGNAL CAN BE EFFECTED AT THE TRANSMITTER STATION, KEY-LOCK MEANS CARRIED BY THE WATCHMEN CONNECTABLE AT EACH STATION TO SET A KEY ELEMENT THEREIN ONLY IF THE NEXT PRECEDING STATION HAS BEEN VISITED AS PRESCRIBED BY SAID PREDETERMINED ROUTE PATTERN, SAID KEY ELEMENT COMPRISING A FRONT ROTATABLE MEMBER AND A REAR NONROTATABLE MEMBER EACH HAVING A RADIAL ARRAY OF AXALLY ALIGNABLE PASSAGES THEREIN, A SET OF TUMBLERS RECEIVED IN THE PASSAGES OF EACH MEMBER AND CERTAIN TUMBLERS IN ONE SET BEING OF UNEQUAL LENGTH AND BOTH SET BEING MUTUALLY BIASED FORWARDLY SO THAT AT LEAST ONE TUMBLER IN ONE MEMBER PARTIALLY EXTENDS INTO THE ADJOINING ALIGNED PASSAGE OF THE OTHER MEMBER THEREBY LOCKING THE MEMBERS AGAINST RELATIVE ROTATION WHEN THE KEY-LOCK MEANS IS NOT BEING SET AT ONE OF SAID STATIONS, SAID KEY LOCK MEANS INCLUDING MEANS TO RESTRAIN FORWARD TRAVEL OF THE SETS OF TUMBLERS AND TO PERMIT ACCESS THERETO AT THE FRONT END OF THE ROTATABLE MEMBER AND PLUG KEY MEANS AT EACH STATION FOR DEPRESSING THE TUMBLERS IN A PRESCEIBED FASHION SO THAT THE ROTATABLE MEMBER IS FREE TO ROTATE RELATIVE TO THE NONROTATABLE MEMBER IN SETTING THE KEY ELEMENT.