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| Number | Title | Issue Date |
| 6971344 | Internal combustion engine An internal combustion engine is provided in which an intake valve, which opens and closes an intake valve hole formed in a cylinder head facing a combustion chamber has a hollow structure. An exhaust valve hole formed in the intake valve is made to open and close b... | 12/06/2005 |
| 4537163 | Intake passages in cylinder heads of an opposed six-cylinder engine Intake passage in cylinder heads of an opposed six-cylinder engine. The cylinder heads are disposed on opposite sides of a crankcase including cylinder blocks. Three cylinders in each cylinder head are arranged in firing order. Intake valves and exhaust v... | 08/27/1985 |
