Patent Classification Explorer PCE

DIFF Main Group

E21D 1/00

Sinking shafts

Introduced: September 1968

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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E21D 1/02 by hand IPC+CPC Available in IPC and CPC
E21D 1/03 mechanically, (E21D1/08 takes precedence) IPC+CPC Available in IPC and CPC
E21D 1/08 while moving the lining downwards IPC+CPC Available in IPC and CPC
E21D 1/10 Preparation of the ground +1 CPC IPC+CPC Available in IPC and CPC