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GB1403767A
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Isolating valves
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AU4591872A
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Improvements in or relating togas-tight isolators and valves
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US3698429A
|
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Gas tight isolators and valves
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GB1308801A
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Gas-tight isolators and valves
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US3460457A
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Isolators for the gas-tight sectionalization of flues and ducts
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US3228389A
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Dampers
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GB1104941A
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Improvements in or relating to isolators for the gas-tight sectionalisation of flues and ducts
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GB1033701A
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Improvements in and relating to dampers
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GB939625A
|
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Improvements in or relating to dampers
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GB935953A
|
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Improvements in or relating to seals for tall chimneys
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US3035810A
|
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Sealing valves for gas control
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GB855306A
|
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Improvements in or relating to seals for ducts
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GB844538A
|
|
Improvements in or relating to sealing valves for gas control
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FR1163099A
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Improvements to curtain registers
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GB802916A
|
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Improvements in or relating to curtain dampers
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DE1036445B
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Sealing of rotary flaps for hot gas ducts
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CA594318A
|
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Curtain dampers
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CA641197A
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Sealing valves for fluid control
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CA596348A
|
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Flue sealing equipment such as dampers, expansion seals and the like
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