E21D1/10 - CPC Classification Index

ClassID:

135944 ⎘

E21D1/10 - CPC Classification

Classification description:

Sinking shafts Preparation of the ground

Sub-classes:

E21D1/105 » {by water level modification} 0
E21D1/12 » by freezing 1
E21D1/16 » by petrification 0

Recent Application in this class:

20200208517

UNDERGROUND VERTICAL SHAFTS AND NUCLEAR REACTORS USING THE SAME

20200088030

UNDERGROUND SHAFT DEVELOPMENT METHOD