vulcanizaban
Imperfect ellos/ellas/ustedes conjugation of vulcanizar.

vulcanizar

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Desde este momento, Rex desarrolló nuevos componentes para las suelas de zapatos que se vulcanizaban directamente en los componentes de piel de los zapatos, convirtiéndose en líderes en la industria.
Rex developed compounds for shoe soles which were directly vulcanized to the leather components of shoes and the company became a leader in this industry.
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