Josef Welzel

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3-Port, 2-position directional control valve

Fluid handling – Systems – Supply and exhaust
Patent

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Method of electro-hydraulic control of longwall mine units

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

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Mine-roof support

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

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Multipole connector for control devices in underground working

Electrical connectors – Coupling part including flexing insulation – Sealing
Patent

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Roof-support distancing apparatus

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

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Profile ID: LFUS-PAI-P-335850

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