| 摘要 |
PROBLEM TO BE SOLVED: To provide a favorably operationally convenient perpetual calendar, which not only display a day singly but also easily discriminate a holiday from a day which is not a holiday. SOLUTION: This perpetual calendar A comprises seven displaying parts displaying days of the week, at least six recesses formed under the displaying parts, and cubically-shaped or rectangularly-shaped day-pieces, each of which is detachably fitted in the recesses and on each of which day-displaying numerals or one to thirty-one are inscribed. The inscription of the thirty-one numerals of the day-pieces are made different in color from the surroundings of the numerals in at least two faces in order to discriminate a holiday from a day, which is not a holiday on one face among six faces of the cubical shape or rectangular shape is inscribed with a numeral having a color different from those remaining faces in order to discriminate a holiday from the days, which are not a holiday. One of at least twelve cubically-shaped or rectangularly-shaped month-pieces, on each of one face of which month-displaying numerals or one to twelve are inscribed is fitted into the topmost recess above the displaying parts. COPYRIGHT: (C)2006,JPO&NCIPI
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