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Priority claimed from US07/423,193external-prioritypatent/US5386803A/en
Priority claimed from US07/552,823external-prioritypatent/US5129365A/en
Application filed by American Colloid CofiledCriticalAmerican Colloid Co
Application grantedgrantedCritical
Publication of TW199868BpublicationCriticalpatent/TW199868B/zh