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ES0318794A1965-10-221965-10-22Mejoras en la construcciën de calderas de agua caliente para instalaciones de calefacciën de circulaciën forzada
ExpiredES318794A3
(es)
Dispositivo para enlazar la tubuladura de entrada de agua caliente y la tubuladura de agua fria de un calentador de agua por circulacion caldeado por gas.