On April 29, 2001, the scientific and technological appraisal under the auspices of the State Bureau of Petroleum and Chemical Industry showed that SZ-97 vacuum coating oil "fills the gaps in the country and ranks the leading level in China".
On April 29, 2001, the scientific and technological appraisal under the auspices of the State Bureau of Petroleum and Chemical Industry showed that SZ-97 vacuum coating oil "fills the gaps in the country and ranks the leading level in China".
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