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CPC
COOPERATIVE PATENT CLASSIFICATION
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RAILWAY OR LIKE TIME OR FARE TABLES; PERPETUAL CALENDARS (calendar blocks B42D 5/04; clockwork driven G04B; comprising computing means G06C)
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)
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G09D 3/00
Perpetual calendars
G09D 3/02
.
with interchangeable members bearing the indicia
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G09D 3/04
.
wherein members bearing the indicia are movably mounted in the calendar
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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
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Last Modified: 10/10/2013