1. A MAGNETIC LATCHING RELAY INCLUDING: AN EVACUATED ENVELOPE; AN ELECTRICALLY CONDUCTIVE TERMINAL PIN EXTENDING INTO SAID ENVELOPE ALONG A FIRST AXIS; AN ELONGATED MOVABLE ELECTRICALLY CONDUCTIVE ARMATURE MEMBER COMPOSED OF A HIGH REMANENCE BI-STABLE MAGNETIC MATERIAL HAVING AN ESSENTIALLY SQUARE HYSTERESIS LOOP AND CAPABLE OF EXHIBITING FIRST AND SECOND STATES OF REMNANT MAGNETIZATION POSITIONED WITHIN SAID ENVELOPE TO EXTEND ESSENTIALLY ALONG SAID FIRST AXIS AND RESILIENTLY COUPLED TO SAID TERMINAL PIN TO BE SUPPORTED THEREBY IN ELECTRICAL CONTACT THEREWITH; A FIRST PAIR OF CONTACT BUTTONS OF ELECTRICALLY CONDUCTIVE MATERIAL MOUNTED ON SAID MOVABLE ARMATURE MEMBER ON OPPOSITE FACES THEREOF IN ELECTRICAL CONTACT THEREWITH AND ADJACENT THE FREE END THEREOF REMOTE FROM SAID TERMINAL PIN; A PAIR OF ROD-SHAPED MAGNETIZABLE FIXED CONTACT MEMBERS EXTENDING THROUGH SAID ENVELOPE AT OPPOSITE SIDES THEREOF AND EXTENDING ALONG A SECOND AXIS ALIGNED WITH SAID FIRST PAIR OF CONTACT BUTTONS ON SAID MOVABLE ARMATURE MEMBER AND TRAVERSING SAID FIRST AXIS; A FURTHER PAIR OF CONTACT BUTTONS OF ELECTRICALLY CONDUCTIVE MATERIAL RESPECTIVELY MOUNTED ON THE INNER ENDS OF SAID FIXED CONTACT MEMBERS IN ELECTRICAL CONTACT THEREWITH AND SPACED FROM SAID FIRST PAIR OF CONTACT BUTTONS TO BE SELECTIVELY ENGAGED THEREBY AS THE FREE END OF SAID MOVABLE ARMATURE MEMBER MOVES FROM ONE SIDE TO THE OTHER OF SAID FIRST AXIS; AND PERMANENT MAGNETIC MEANS MOUNTED EXTERNALLY OF SAID ENVELOPE AND IN ENGAGEMENT WITH THE RESPECTIVE OUTER ENDS OF SAID FIXED CONTACT MEMBERS FOR MAGNETIZING SAID FIXED CONTACT MEMBERS WITH OPPOSITE MAGNETIC POLARITIES, SO AS TO CAUSE SAID ARMATURE SELECTIVELY TO MOVE AGAINST AND LATCH WITH ONE OF SAID FIXED CONTACT MEMBERS OR THE OTHER AS DETERMINED BY THE STATE OF REMNANT MAGNETIZATION OF SAID ARMATURE.