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Radon gas exhaust system

Pipe joints or couplings – With casing – lining or protector – Insulated
Patent

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Rain gutter and downspout connection

Pipe joints or couplings – With casing – lining or protector – Insulated
Patent

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Reconfigurable loop of tubular elements

Pipe joints or couplings – With casing – lining or protector – Insulated
Patent

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Releasable coupling for air carrying tubes

Pipe joints or couplings – With casing – lining or protector
Patent

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Removable fluid swivel for mooring terminals

Pipe joints or couplings – With casing – lining or protector – Insulated
Patent

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Replaceable pipe liner assembly

Pipe joints or couplings – With casing – lining or protector – Lined
Patent

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Resilient annular seal with supporting liner

Pipe joints or couplings – With casing – lining or protector – Lined
Patent

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Rigid duct with bendable elbow

Pipe joints or couplings – With casing – lining or protector – Insulated
Patent

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Riser assembly for underground pipe connections

Pipe joints or couplings – With casing – lining or protector
Patent

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Rod coupling for oil well sucker rods and the like

Pipe joints or couplings – With casing – lining or protector
Patent

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Roll grooved pipe

Pipe joints or couplings – With casing – lining or protector – Lined
Patent

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Rotary joint device for a cryogenic liquid

Pipe joints or couplings – With casing – lining or protector – Insulated
Patent

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Rust-resistant sleeve for use in a branch hole of a water pipeli

Pipe joints or couplings – With casing – lining or protector – Lined
Patent

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