DIFF Subgroup
C03C 3/15 containing rare earths
Introduced: January 1985
Full Title
Glass compositions > Silica-free oxide glass compositions > containing boron > containing rare earths
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 1985.
Child Classifications
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- C03C 3/155 containing zirconium, titanium, tantalum or niobium since 1985 IPC+CPC Available in IPC and CPC