CPC Main Group
E21D 17/00 Caps for supporting mine roofs
5 direct subcodes
Child Classifications
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- E21D 17/01 characterised by the shape of the cap, e.g. of specified cross-section
- E21D 17/02 Cantilever extension or similar protecting devices
- E21D 17/10 Details of mine caps for engaging the tops of pit-props, with or without retaining-plates; Retaining-plates