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US3374725A
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Valve for air raid shelters
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DE1559638A1
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Automatic shut-off valve for air supply and discharge lines from protective rooms
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DE1559636A1
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Automatic shut-off valve for air supply and discharge lines from protective rooms
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DE1559635A1
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Automatic shut-off valve for gas supply and discharge lines from protective rooms
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GB1094682A
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An automatically closing valve for an air inlet pipe or an air outlet pipe of an air-raid shelter
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FR87755E
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Valve for air intake and exhaust pipes in shelters
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DE1434913A1
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Valve for air supply and discharge lines from protective rooms
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DE1434912A1
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Automatic shut-off valve for air supply and discharge lines from protective rooms
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DE1434911A1
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Valve for air supply and discharge lines from protective rooms
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GB1022058A
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A valve for an air inlet pipe or an air outlet pipe of an air raid shelter
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GB956435A
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A valve for controlling air flow
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US3139811A
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Air duct valve for shelter
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FR1300562A
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Air Line Valve for Shelters
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DE1181552B
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Automatic locking device for ventilation lines in protective rooms
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