| G | SK | PHYSICS |
| G09 | KL | EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS |
| G09D | UKL | RAILWAY OR LIKE TIME OR FARE TABLES; PERPETUAL CALENDARS (calendar blocks B42D 5/04; clockwork-driven G04B; comprising computing means G06C) |
| G09D 1/00 | HGR | 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 | HGR | Perpetual calendars |
| G09D 3/02 | UGR1 | | . | with interchangeable members bearing the indicia |
|
| G09D 3/04 | UGR1 | | . | wherein members bearing the indicia are movably mounted in the calendar |
|
| G09D 3/06 | UGR2 | | . . | with rotatable members |
|
| G09D 3/08 | UGR3 | |
| G09D 3/10 | UGR2 | | . . | with members in band form |
|
| G09D 3/12 | UGR1 | |