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ÇóһƪÃÀ¹úרÀûÎÄÏ×Óйغ¬Á××èȼ¼Á U.S.Pat.No.3,855,359(to E.D.Weil,patented,June 24,1975) which describes fire retardant phosphorus oligomers formed by condensationt of beta-haloalkyl esters of pentavalent phosphorus acid. лл¸÷λ£¡ |
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