Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F01
MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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F01L
CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
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1/00
Valve-gear or valve arrangements, e.g. lift-valve gear
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F01L1/46
Component parts, details, or accessories, not provided for in preceding subgroups
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F01L2001/467
Lost motion springs
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