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Individual
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Individual
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Priority to ES73651ApriorityCriticalpatent/ES73651A1/en
Publication of ES73651A1publicationCriticalpatent/ES73651A1/en
ES73651A1920-05-101920-05-10
Improvements in piston rings, or their analogues, with the corresponding methods for their manufacture.
ExpiredES73651A1
(en)