Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor ( shifting of mine conveyors at the working face E21F13/08)

Child Classifications

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• E21D 23/0004 +4 CPC CPC only CPC only
• E21D 23/0047 CPC only CPC only
• E21D 23/0052 CPC only CPC only
• E21D 23/0056 CPC only CPC only
• E21D 23/006 +4 CPC CPC only CPC only
• E21D 23/0082 CPC only CPC only
• E21D 23/0086 +2 CPC CPC only CPC only
• E21D 23/03 having protective means, e.g. shields, for preventing or impeding entry of loose material into the working space or support since 1985 IPC+CPC Available in IPC and CPC
• E21D 23/04 Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor (E21D23/14 takes precedence) +10 CPC IPC+CPC Available in IPC and CPC
• E21D 23/08 Advancing mechanisms (E21D23/16 takes precedence) +1 CPC IPC+CPC Available in IPC and CPC
• E21D 23/12 Control, e.g. using remote control (E21D23/16 takes precedence) IPC+CPC Available in IPC and CPC
• E21D 23/16 Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices IPC+CPC Available in IPC and CPC