Indicator unit and switch

Claim 1

AN INDICATOR/SWITCHING ASSEMBLY INCLUDING: A HOUSING HAVING A SHOULDER FORMED ON THE EXTERNAL SURFACE THEREOF; A BRACKET MOUNTED ON SAID HOUSING AND EXTENDING ACROSS THE REAR END THEREOF, SAID BRACKET HAVING A PLURALITY OF LAMP-RECEIVING APERTURES THEREIN; A CASING FOR RECEIVING SAID HOUSING IN SLIDING TELESCOPIC RELATIONSHIP THEREWITH AND INCLUDING INWARDLY EXTENDING LANCE MEANS; MEANS INCLUDING A SPRING-LOADED SWITCH-ACTUATOR PIN MOUNTED IN SAID CASING IN POSITION TO ENGAGE SAID HOUSING AND TO BIAS SAID HOUSING TOWARDS THE FORWARD END OF SAID CASING AND SAID SHOULDER AGAINST SAID LANCE MEANS, SAID SWITCH-ACTUATOR PIN BEING MOVED ALONG SAID CASING TOWARD THE REAR END THEREOF BY SAID HOUSING WHEN SAID HOUSING IS MOVED INTO SAID CASING; AND A PLURALITY OF SPRING-LOADED RESILIENT ELECTRICAL CONTACTS MOUNTTED IN SAID CASING IN AXIAL ALIGNMENT WITH RESPECTIVE ONES OF THE APERTURES IN SAID BRACKET TO MAKE SELECTIVE CONTACT WITH ELECTRIC LAMPS SUPPORTED IN SAID BRACKET AND TO BE MOVED BACK ALONG SAID CASING BY SUCH LAMPS WHEN SAID HOUSING IS MOVED INTO SAID CASING.