Component parts or details of props

Full Title

Props; Chocks > Component parts or details of props

Classification Context

Section:

FIXED CONSTRUCTIONS

Class:

EARTH OR ROCK DRILLING; MINING

Subclass:

SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS

Child Classifications

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• E21D 15/502 Prop bodies characterised by their shape, e.g. of specified cross-section
• E21D 15/51 specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
• E21D 15/52 Extensible units located above or below standard props
• E21D 15/54 Details of the ends of props
• E21D 15/56 Details of locks of telescopic props