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F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
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FR569079D1923-07-261923-07-26Perfectionnements aux soupapes pour moteurs à combustion interne
ExpiredFR569079A
(fr)