Patent ID: 7363735

Claim:
A calendar comprising two sheets with one laid flat against the other and the sheets being moveable one over the other, one of the sheets being an intended lower sheet and the other sheet being an intended upper sheet, one sheet bearing the numbers “1” to “31” marked on it in order with uniform spacing between successive numbers and the other sheet bearing markings with uniform spacing between them such that the numbers can be brought into registration with respective ones of the markings, successive markings being indicative of successive days of the week in cyclical fashion for at least a full five weeks, so that the number 1 on the sheet bearing the numbers can be brought into registration with any selected one of the markings representing any day of the week, each month being represented by an indication on the sheet bearing the said markings adjacent to a marking indicative of that day of the week on which the first day of that month falls, there being apertures formed in the intended upper one of the sheets and further marks on the intended underneath sheet such that when the indication of a given month on one of the sheets is brought adjacent to the number one on the other sheet, a mark appears through one of the apertures which is in registration with that number on the said one of the sheets which corresponds with the last day of the given month.