DIFF Subgroup
E01B 3/44 made from other materials only if the material is essential
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails > made from other materials only if the material is essential
CPC:
Transverse or longitudinal sleepers (for switches or crossings E01B7/22); Other means resting directly on the ballastway for supporting rails > made from other materials only if the material is essential
No child classifications to compare. This is a leaf node in both IPC and CPC.