Inventor
AOKI SHUMA
JP4 patents
Patents
4 patentsUS9791045B2Oct 17, 2017
Oil ring
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Spark-ignition internal combustion engine
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US10968817B2Apr 6, 2021
Spark-ignition internal combustion engine
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US10907533B2Feb 2, 2021
Spark-ignition internal combustion engine
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