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DIFF Subgroup
E21D 11/30

Bases for lower arch members (for props E21D15/54)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Bases for lower arch members

CPC: Bases for lower arch members (for props E21D15/54)

Full Title

Full titles differ between systems:

IPC:

Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings , e.g. by assembling > Lining predominantly with metal > Bases for lower arch members

CPC:

Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling (E21D15/00 - E21D23/00 take precedence; specially for shafts E21D5/00; ; lining pressure water galleries, linings therefor E02B9/06) > Lining predominantly with metal > Bases for lower arch members (for props E21D15/54)

No child classifications to compare. This is a leaf node in both IPC and CPC.