Perpetual calendar

Claim 1

A PERPETUAL CALENDAR COMPRISING A BODY STRUCTURE AND A SLIDE STRUCTURE, MEANS ON THE BODY STRUCTURE FOR SUPPORTING SAID SLIDE STRUCTURE FOR RELATIVE MOVEMENT THEREBETWEEN, SAID SLIDE STRUCTURE HAVING INDICIA THEREON REPRESENTING THE DAYS OF THE MONTHS OF THE YEAR, SAID BODY STRUCTURE BEING CONSTRUCTED TO OVEDRLIE THE SLIDE MEMBER AND CONCEAL PORTIONS OF THE LATTER WHILE EXPOSING OTHER PORTIONS THEREOF, WITH THE EXPOSED PORTIONS CONTAINING DATE DESIGNATING INDICIA FOR EACH MONTH OF THE YEAR, SAID BODY STRUCTURE HAVING INDICIA THEREON COOPERATING WITH THE INDICIA ON SAID SLIDE STRUCTURE TO DESIGNATE THE DAYS OF THE WEEK ON WHICH THE MONTHLY DATES FALL, MOVEMENT OF SAID SLIDE STRUCTURE RELATIVE TO THE BODY STRUCTURE BEING OPERATIVE TO VARY THE RELATIONSHIP BETWEEN THE DAY DESIGNATIONS AND THE DATE DESIGNATIONS WHEREBY THE DAYS FOR EACH MONTH MAY BE CHRONOLOGICALLY ARRANGED TO START ON ANY SELECTED DAY OF THE WEE, SAID SLIDE STRUCTURE BEING CONSTRUCTED IN THE FORM OF A PLURALITY OF SECTIONS INCLUDING AN UPPER SECTION AND A LOWER SECTION PROVIDING INTERLOCKING AND COMPLEMENTALLY FORMED SLIDE SECTIONS IN THE SAME PLANE AND CONTROLLED BY THE UPPER SECTION, THE UPPER SECTION CONTAINING THE DATE DESIGNATING INDICIA FOR ONLY THE MONTHS OF JANUARY AND FEBRUARY AND WITH THE NUMBER OF DAYS INDICATED FOR FEBRUARY CONTROLLED BY THE RELATIONSHIP BETWEEN THE UPPER SECTION AND THE LOWER SECTION, THE DIVIDING LINE BETWEEN SAID UPPER SECTION AND THE ADJACENT LOWER SECTION BEING VERTICAL AND DISPOSED IMMEDIATELY FOLLOWING THE INDICIA REPRESENTING THE 28TH DAY OF FEBRUARY, SAID SECTIONS COMPLEMENTALLY FORMED PROVIDING A LOST-MOTION CONNECTION SO THAT RELATIVE MOVEMENT OF SUCH SECTION RELATIVE TO THE ADJACENT SECTION BEING OPERATIVE TO EXPOSE INDICIA DESIGNATING A 29TH DAY OF FEBRUARY TO PROVIDE THE LOST-MOTION CONNECTION BETWEEN SAID SECTIONS AND SIMULTANEOUSLY SHIFT THE DAYS OF ALL SUBSEQUENT MONTHS ACCORDINGLY, AND SAID UPPER SECTION AND SAID ADJACENT LOWER SECTION COMPLEMENTALLY FORMED WITH A PLURALITY OF VERTICAL DIVIDING LINES SO THAT IN ONE POSITION OF SAID SECTIONS TO THE EXTREME RIGHT OPENINGS MAY BE FORMED CORRESPONDING TO THE EXPOSED INDICIA FOR THE 29TH DAY OF FEBRUARY WITH ONE SET OF COMPLEMENTALLY FORMED VERTICAL DIVIDING LINES OF SAID SECTIONS OPERATIVELY ENGAGED, AND WITH SAID SECTIONS TO THE EXTREME RIGHT ALL OF SAID VERTICAL DIVIDING LINES OPERATIVELY ENGAGE WITH THE EXCEPTION OF ONE SET CORRESPONDING TO THE EXPOSED INDICIA SPACING, AND SAID UPPER AND LOWER SECTIONS OPERATIVE FOR REGULAR YEARS BY MOVING THE UPPER SECTION TO THE EXTREME LEFT, THEN RIGHT TO THE DESIRED YEAR ON SAID UPPER SECTION, AND OPERATIVE TO SAID LEAP YEARS BY MOVING THE UPPER SECTION TO THE EXTREME RIGHT, THEN LEFT TO THE DESIRED LEAP YEAR ON SAID UPPER SECTION AND IDENTIFIED IN A COLOR DIFFERENT FROM THAT OF THE REGULAR YEARS.