DIFF Main Group
G04G 9/00 Visual time or date indication means
Introduced: January 1980
CPC subdivides this area 5x more granularly than IPC with 7 additional codes.
7 codes are CPC-only extensions.
IPC defines codes here since 1980.
Child Classifications
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- G04G 9/02 by selecting desired characters out of a number of characters or by selecting indicating elements the position of which represent the time, e.g. by using multiplexing techniques since 1980 +3 CPC IPC+CPC Available in IPC and CPC
- G04G 9/08 by building-up characters using a combination of indicating elements, e.g. by using multiplexing techniques since 1980 +3 CPC IPC+CPC Available in IPC and CPC