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据《金属导报》2月10日报导:1987年9月7—10日在加拿大温哥华市召开第四届国际钨协座谈会。这次会议由加拿大钨业公司发起、国际钨协具体组织(简称 P.T.A.)召开。
According to the “Metal Herald” reported February 10: 1987 September 7-10 in Vancouver, Canada held the fourth session of the International Tungsten Association Symposium. The meeting was initiated by the Canadian Tungsten Company and the International Tungsten Carbide Organization (P.T.A.) was held.