Sectional digital switch

Claim 1

IN A DIGITAL SWITCHING SYSTEM: A PLURALITY OF SUBSTANTIALLY IDENTICAL UNITS ASSEMBLED SIDE-BY-SIDE INTO A COMPACT DIGITAL SWITCHING ASSEMBLY, EACH UNIT INCLUDING: A CASING PROVIDING THEREWITHIN A MOUNTING CHAMBER, A DIGIT-CARRYING WHEEL ROTATABLY MOUNTED IN SAID CHAMBER, SAID WHEEL HAVING AN INTERRUPTED CIRCUMFERENTIAL FINGER FLANGE PROVIDING A PLURALITY OF OUTSTANDING FINGER LUGS AND A PLURALITY OF FINGER NOTCHES DISPOSED BETWEEN SAID LUGS, AND SAID WHEEL HAVING A DIGIT-CARRYING RIM AT ONE SIDE OF SAID FLANGE, SAID CASING HAVING AN OUTER FACE WALL PROVIDED IN ITS MIDDLE PORTION WITH A VIEW OPENING LEAVING A FINGERSTOP PORTION OF SAID FACE WALL AT EACH END OF SAID OPENING, A PERIPHERAL PORTION OF SAID FINGER FLANGE PROJECTING THROUGH SAID OPENING AND A PERIPHERAL PORTION OF SAID RIM PROJECTING INTO SAID OPENING BETWEEN SAID FINGER-STOP WALL PORTIONS, WHEREBY TO PRESENT TO VIEW A SELECTED MEMBER OF A PLURALITY OF DIGITS APPEARING AROUND SAID RIM; MEANS EXTENDING THROUGH SAID UNITS AND BINDING THEM TOGETHER, EACH CASING HAVING, AT THE SIDE OF ITS VIEW OPENING OPPOSITE THE FINGER FLANGE, A LIP EXTENDING LATERLLY A SHORT DISTANCE TOWARD THE FINGER FLANGE OF THE ADJACENT CASING AND UNDERLYING PORTIONS OF THE FINGER-STOP PORTIONS OF THE ADJACENT UNIT TO ASSIST MAINTENANCE OF THE ASSEMBLT; A CIRCUIT BOARD MOUNTED IN EACH CASING AT THE SIDE THEREOF ADJACENT THE RESPECTIVE FINGER FLANGE AND UNDERLYING THE LIP OF THE ADJACENT CASING; A WIPER SWITCH PLATE MOUNTED ABOUT THE AXIS OF EACH WHEEL AND SECURED THERETO ON THE SIDE FACING THE ADJACENT CIRCUIT BOARD, SAID SWITCH PLATE AND CIRCUIT BOARD IN EACH CASE HAVING COOPERATING CONTACTS; AND TERMINAL MEANS ON EACH CIRCUIT BOARD CONNECTED WITH THE RESPECTIVE CONTACTS.