Blade-type electric fuses

Claim 1

AN ELECTRIC HIGH INTERRUPTING CAPACITY FUSE COMPRISING IN COMBINATION: (A) A SUBSTANTIALLY TUBULAR CASING OF INSULATING MATERIAL HAVING A PREDETERMINED INNER DIAMETER; (B) A PAIR OF TERMINAL CAPS CLOSING THE ENDS OF SAID CASING; (C) A PAIR OF ALIGNED KNIFE BLADE CONTACTS HAVING A PREDETERMINED WIDTH BUT SLIGHTLY LESS THAN SAID DIAMETER EACH PROJECTING FROM THE OUTSIDE OF SAID CASING THROUGH THE END SURFACE OF ONE OF SAID PAIR OF TERMINAL CAPS INTO THE INSIDE OF SAID CASING; (D) A PAIR OF SPACED THIN SHEET METAL RIBBONS OF A METAL HAVING A RELATIVELY HIGH CONDUCTIVITY AND A RELATIVELY HIGH FUSING POINT APPROXIMATELY EQUAL IN WIDTH TO SAID PREDETERMINED WIDTH CONDUCTIVELY INTERCONNECTING THE AXIALLY INNER ENDS OF SAID PAIR OF BLADE CONTACTS, EACH OF SAID PAIR OF RIBBONS INCLUDING A LATTICE PATTERN AREA OF NECKS CONNECTED IN PARALLEL AND OF SERIALLY CONNECTED NECKS, SAID LATTICE PATTERN AREA BEING FORMED BY SUBSTANTIALLY TRANSVERSE LINES OF PERFORATIONS, EACH OF SAID LINES OF PERFORATIONS INCLUDING A PREDETERMINED NUMBER OF PERFORATIONS PER LINE, THE NUMBER OF PERFORATIONS PER LINE BEING SUBSTANTIALLY IN EXCESS OF THE NUMBER OF LINES OF PERFORATIONS, EACH OF SAID PAIR OF RIBBONS HAVING AXIALLY OUTER ENDS SANDWICHING THEREBETWEEN THE AXIALLY INNER ENDS OF SAID PAIR OF KNIFE BLADE CONTACTS, AND EACH OF SAID PAIR OF RIBBONS HAVING A PAIR OF FLEXIBLE BENDS SITUATED ADJACENT TO ONE OF THE AXIALLY OUTER ENDS THEREOF; (E) A FILLED OF QUARTZ SAND INSIDE OF SAID CASING EMBEDDING SAID PAIR OF RIBBONS; AND (F) TWO PAIRS OF INSULATING PLATES EACH SUBSTANTIALLY COEXTENSIVE WITH SAID LATTICE PATTERN AREA OF ONE OF SAID PAIR OF RIBBONS AND EACH AFFIXED TO ONE OF SAID PAIR OF RIBBONS ON JUXTAPOSED SIDES THEREOF.