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PCE
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CPC Subgroup
F28F 11/04

using pairs of obturating elements, e.g. washers, mounted upon central operating rods (F28F11/06 takes precedence)

Full Title

Arrangements for sealing leaky tubes and conduits (stopping flow from or in pipes in general F16L55/10) > using pairs of obturating elements, e.g. washers, mounted upon central operating rods (F28F11/06 takes precedence)