共 7 条
[1]
BECHTOLD MF, 1951, Patent No. 2574902
[2]
Bird P., 1941, US Patent, Patent No. [2244325, 2,244,325]
[4]
ILER RK, 1955, COLLOID CHEM SILICA, P248
[5]
Rule J. M., 1951, US Patent, Patent No. [2, 577, 485, 2577485]
[7]
[No title captured]

