E21D17/00 - CPC Classification

Caps for supporting mine roofs

• E21D17/003 » {with essential hydraulic elements} 2
• E21D17/006 » {characterised by the material} 2
• E21D17/01 » characterised by the shape of the cap, e.g. of specified cross-section 3
• E21D17/02 » Cantilever extension or similar protecting devices 1
• E21D17/10 » Details of mine caps for engaging the tops of pit-props, with or without retaining-plates; Retaining-plates 1

Recent Application in this class: