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Dual valve lift blip with single cam lobe for gasoline engines

Internal-combustion engines – Poppet valve operating mechanism – Tappet
Reexamination Certificate

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Dual valve lifter assembly

Internal-combustion engines – Poppet valve operating mechanism – Tappet
Reexamination Certificate

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Dual-acting apparatus for variable valve timing and the like

Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent

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Dual-equal cam phasing with variable overlap

Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate

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Dual-pressure hydraulic valve-actuation system

Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Patent

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Ductile iron roller tappet body and method for making same

Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent

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Durable valve lifter for combustion engines and methods of...

Internal-combustion engines – Poppet valve operating mechanism – Tappet
Reexamination Certificate

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Dynamic camshaft apparatus

Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
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Dynamic valve mechanism of internal combustion engine

Internal-combustion engines – Poppet valve operating mechanism – Rocker
Patent

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Dynamic valve timing adjustment mechanism for internal...

Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
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