| 摘要 |
<p>1,175,422. Phosphoric acid production. PULLMAN Inc. 2 Jan., 1967 [3 Jan., 1966; 19 April, 1966], No. 130/67. Addition to 1,175,421. Heading C1A. The invention of Specification 1,175,421 is modified by mixing phosphoric acid with phosphate rock before the latter is added to the cyclic flow path.</p> |
