DIFF Subgroup
A63H 19/24 Electric toy railways; Systems therefor
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Model railways > Electric toy railways; Systems therefor
CPC:
Model railways (propulsion by special interaction between vehicle and track A63H18/00) > Electric toy railways; Systems therefor
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
Note: 2 CPC extensions are marked as secondary classification only.
Child Classifications
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