Epígrafe que corresponde a la realización de asesoramiento técnico en relación con procesos químicos y depuración ambiental, incluyendo análisis químico-biológicos y toma de datos para informar o mejorar problemas ambientales.
Si el sujeto pasivo es una persona jurídica, le corresponde el epígrafe 843.9 de la Sección 1ª (otros servicios técnicos n.c.o.p.).
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