4. C - Chemistry, Metallurgy
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  6. D

Purification of pyromellitic dianhydride

C - Chemistry – Metallurgy – 07 – D

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260/374

C07D 307/89 (2006.01) C07C 51/573 (2006.01)

Patent

CA 1024520

Debus Henri R.

B - Operations – Transporting – 01 – J
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Draguez Tripels de Hault Emmanuel R.e.g.

C - Chemistry – Metallurgy – 07 – C
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Van Tongelen Marcel

C - Chemistry – Metallurgy – 07 – C
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Labofina S.a.

C - Chemistry – Metallurgy – 07 – C
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