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Brevet
Photo Numéro du brevet Nom du brevet Type de brevet Date de disponibilité -- Date d’expiration Vérifié
A two - speed drilling rig ZL201801894350.7 A two - speed drilling rig UTILITY_MODEL 2019-06-27 ~ 2028-11-17 Vérifié
A well drilling machine with convenient replacement of transition joint and good sealing performance ZL 2019 2 0057333.6 A well drilling machine with convenient replacement of transition joint and good sealing performance UTILITY_MODEL 2019-09-05 ~

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