Miniaturized flashlight with replacement cartridge unit

Claim 1

A MINIATURE ILLUMINABLE FOB OF THE CHARACTER DESCRIBED HAVING CASING COMPRISING TWO SEPARABLE CASING HALVES, EACH BEING DISH SHAPED TO INCLUDE A SUBSTANTIALLY FLAT WALL AND A PERIPHERAL SIDE WALL TERMINATING IN A FREE EDGE FORMING AN ABUTMENT CLOSURE JOINT WITH THE FREE EDGE OF THE OTHER CASING HALF, THE FLAT WALL OF ONE OF SAID CASING HALVES HAVING AN OPENING WITH A PUSH BUTTON MOUNTED THEREIN, A FRONT PORTION OF EACH OF SAID SIDE WALLS HAVING A CENTRALIZED RECESS FORMING AN OPENIGN IN THE CASING, A REPLACEABLE BATTERY-BULB-SWITCH CARTRIDGE UNIT POSITIONED WITHIN SAID CASING HAVING A BULB LOCATED IN ALIGNMENT WITH SAID OPENING AND A LEAF SPRING SWITCH POSITIONED FOR ACTUATION BY A FINGER PRESSURE ON SAID PUSH BUTTON, A PAIR OF TABS EXTENDING FROM THE FRONT SIDE WALL PORTION OF ONE OF SAID CASING HALVES LOCATED ON OPPOSITE SIDES OF SAID RECESS INWARDLY OFFEST FROM THE FREE EDGE THEREOF AND ABUTTING THE INTERIOR SURFACE OF THE FRONT SIDE WALL PORTION OF THE OTHER CASING HALF, AND A BROAD TAB EXTENDING FROM A REAR SIDE WALL PORTION OF SAID OTHER CASING HALF OUTWARDLY OFFSET FROM THE FREE EDGE THEREOF AND ABUTTING THE EXTERIOR SURFACE OF THE REAR SIDE WALL PORTION OF SAID FIRST MENTIONED CASING HALF, SAID TABS AND ABITTING WALL PORTIONS HAVING MALE AND FEMALE INTERLOCKING MEANS FOR RELEASABLY RETAINING SAID CASING HALVES IN SAID EDGE ABUTMENT, SAID BROAD TAB HAVING A CENTRAL PORTION CUT AND STAMPED THEREFROM PROVIDING A CLOSED LINK FOR CONNECTING SAID CASING TO A CHAIN.