DIFF Subgroup
F28F 13/14 by endowing the walls of conduits with zones of different degrees of conduction of heat
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Arrangements for modifying heat transfer, e.g. increasing, decreasing > by endowing the walls of conduits with zones of different degrees of conduction of heat
CPC:
Arrangements for modifying heat-transfer, e.g. increasing, decreasing (F28F1/00 - F28F11/00 take precedence) > by endowing the walls of conduits with zones of different degrees of conduction of heat
No child classifications to compare. This is a leaf node in both IPC and CPC.