E21D9/116 - CPC Classification Index

ClassID:

136020 ⎘

E21D9/116 - CPC Classification

Classification description:

Tunnels or galleries, with or without linings; Methods or apparatus for making thereof ; Layout of tunnels or galleries; Making by using boring or cutting machines with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines by means of non-concentric rotary heads

Sub-classes:

E21D9/117 » {mounted for orientating or sideways shifting relative to the frame} 4
E21D9/118 » {with independently driven central head} 0

Recent Application in this class:

20210340870

Automatic coal mining machine and fluidized coal mining method

20210317739

Mining machine applicable to fluidized mining of ore bodies and mining method

20210231013

Hard rock roadway and tunnel boring machine with actively rotating hobs

20180347356

Apparatus and method for driving a cavity in mining

20120051843

TUNNEL DRILLING MACHINE