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F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
F02F3/00—Pistons
F02F3/10—Pistons having surface coverings
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FR27325D1922-10-241922-10-24Dispositif pour réduire la déperdition des calories dans les moteurs thermiques et autres appareils similaires
ExpiredFR27325E
(fr)