4. Static structures (e.g., buildings)
  5. Three-way corner construction
  6. Barrier resting on top of vertical structures; e.g., walls

Jack Kennedy Metal Products and Buildings Inc.

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Adjustable stairway for use with an overcast in a mine

Static structures (e.g. – buildings) – Stepped; e.g. – stair – Interconnected relatively movable components
Reexamination Certificate

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Contractible mine stopping and contractible block member for use

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel
Patent

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Contractible mine stopping and contractible block member for use

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel
Patent

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Door system for a mine stopping

Movable or removable closures – With means mounting closure for swinging – With latch or lock
Patent

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Mine door power drive system

Ventilation – Mine – With partition means
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1621890

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