DIFF Subgroup
C21B 7/18 Bell-and-hopper arrangements
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Blast furnaces > Bell-and-hopper arrangements
CPC:
Blast furnaces (lifts associated with blast furnaces B66B9/06) > Bell-and-hopper arrangements
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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