E21F1/145 - CPC Classification Index

ClassID:

136258 ⎘

E21F1/145 - CPC Classification

Classification description:

Ventilation of mines or tunnels; Distribution of ventilating currents; Air partitions; Air locks Air locks

Recent Application in this class:

20140349562

Change Over Station and Method

20140273791

MINE AIRLOCK SYSTEM AND METHOD

20090042504

Tunnel cover for a tunnel for controlled ventilation of gas