G
SECTION G — PHYSICS
  
INSTRUMENTS
 G09
EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
 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