|  | G |
SECTION G — PHYSICS

INSTRUMENTS

|  | G09 |
EDUCATION; CRYPTOGRAPHY; ADVERTISING; SEALS

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

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