1. A HIGHLY SHOCKPROOF AND OPERATIONAL HIGHLY SENSITIVE ELECTROMAGNETIC MINIATURE RELAY, COMPRISING A SOLENOID HAVING A COIL SURROUNDED BY A SOFT IRON SLEEVE AND HAVING A SOFT IRON CORE EXTENDING OVER THE GREATER PART OF THE LENGTH THEREOF, A CYLINDRICAL ARMATURE EXTENDING INTO SAID SOLENOID FOR MAGNETIC COOPERATION WITH SAID CORE, THE INNER END OF SAID ARMATURE BEING NORMALLY SEPARATED FROM THE END OF SAID CORE BY AN AIR GAP, A DEVICE FOR MOUNTING SAID ARMATURE FOR FRICTIONLESS LONGITUDINAL MOTION WITHIN SAID SOLENOID, SAID DEVICE COMPRISING A PAIR OF LONGITUDINALLY SPACED SPRING MEMBERS, OF ANNULAR CONFIGURATION, EXTENDING TRANSVERSELY TO THE DIRECTION OF MOVEMENT OF SAID ARMATURE, A PAIR OF SPACED OPPOSITELY DISPOSED LONGITUDINALLY EXTENDING MEMBERS OPERATIVELY CONNECTING SAID SPRING MEMBERS AND FORMING A PARALLEL GUIDE FOR SAID ARMATURE, ONE OF SAID SPACED MEMBERS BEING MOUNTED IN FIXED RELATION WITH RESPECT TO SAID COIL AND FORMING A SUPPORT FOR SAID SPRING MEMBERS, MEANS FOR CONNECTING THE OUTER END OF SAID ARMATURE TO THE OTHER OF SAID SPACED MEMBERS, A FIRST CONTACT OPERATIVELY CONNECTED TO SAID LAST-MENTIONED SPACED MEMBER FOR COOPERATION WITH RELATIVELY FIXEDLY DISPOSED SECOND CONTACT MEANS, SAID SECOND CONTACT MEANS EXTENDING THROUGH THE ADJACENT ANNULAR SPRING MEMBER, AND SAID FIRST-MENTIONED CONTACT MEANS EXTENDING RADIALLY INWARDLY FROM THE SPACED MEMBER WITH WHICH IT IS ASSOCIATED AND A CASING FORMING A HERMETICALLY SEALED CONTACT CHAMBER FOR ENCLOSING SAID GUIDE AND SAID CONTACT MEANS.