having closed fluid system, e.g. with built-in pumps or accumulators

Full Title

Props; Chocks > Telescopic props > Hydraulic, pneumatic, or hydraulic-pneumatic props > having closed fluid system, e.g. with built-in pumps or accumulators

Classification Context

Section:

FIXED CONSTRUCTIONS

Class:

EARTH OR ROCK DRILLING; MINING

Subclass:

SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS