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F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
F16L37/00—Couplings of the quick-acting type
F16L37/56—Couplings of the quick-acting type for double-walled or multi-channel pipes or pipe assemblies
F16L37/565—Concentric pipes
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FR632258D1926-07-171926-07-17Dispositif d'accouplement métallique pour véhicules de chemins de fer
ExpiredFR632258A
(fr)