E21D1/12 - CPC Classification Index

ClassID:

135946 ⎘

E21D1/12 - CPC Classification

Classification description:

Sinking shafts; Preparation of the ground by freezing

Sub-classes:

E21D1/14 » Freezing apparatus 1

Recent Application in this class:

20170350087

Artificial ground freezing method and artificial ground freezing system