with longitudinally-divided upper or lower prop parts, e.g. interfitting laminations

Full Title

Props; Chocks > Telescopic props > with parts held relatively to each other by friction or gripping, e.g. using wedges > with longitudinally-divided upper or lower prop parts, e.g. interfitting laminations

Classification Context

Section:

FIXED CONSTRUCTIONS

Class:

EARTH OR ROCK DRILLING; MINING

Subclass:

SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS