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in jan. 1982, the schedule of the first staff congress of rizhao county chemical plant and presidium list.
in oct. 1987,<< rizhao industrial journal>> gave a general predecessor introduction of rizhao chemical plant and some related data.
in feb. 1989, the notice of establishing seaweed industry association
in jul. 1990, the application of rizhao chemical plant assigned to the provincial chemical import and export company.
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