WebCPC CPC COOPERATIVE PATENT CLASSIFICATION

G09D　RAILWAY OR LIKE TIME OR FARE TABLES; PERPETUAL CALENDARS (calendar blocks B42D 5/04; clockwork driven G04B; comprising computing means G06C)

G09D 1/00 Railway or like time or fare tables; Indicating or reading aids therefor (essentially incorporating maps or route diagrams G09B; railway routing charts G09B; display devices, e.g. railway indicator boards G09F)

G09D 3/00 Perpetual calendars

G09D 3/02 ・with interchangeable members bearing the indicia

G09D 3/04 ・wherein members bearing the indicia are movably mounted in the calendar

G09D 3/06 ・・with rotatable members

G09D 3/08 ・・・of disc form

G09D 3/10 ・・with members in band form

G09D 3/12 ・electrically operated