4. Hydraulic and earth engineering
  5. Earth treatment or control
  6. Shoring, bracing, or cave-in prevention

Holger Kellermann

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Longwall support control for controlling the movements of...

Mining or in situ disintegration of hard material – Automatic control; signaling or indicating – Of hard material disintegrating machine
Reexamination Certificate

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Timbering and walling control for controlling the movements...

Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Reexamination Certificate

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Profile ID: LFUS-PAI-P-3157507

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