共 7 条
[1]
DOW CHEM CO, 1940, Patent No. 2158595
[2]
DOW CHEM CO, 1940, Patent No. 2222012
[3]
DOW CHEM CO, 1940, Patent No. 2225543
[4]
DREISBACH, 1938, Patent No. 2110829
[5]
DREISBACH RR, 1941, Patent No. 2240764
[6]
STOESSER S, 1939, Patent No. 2181102
[7]
1942, OIL GAS J 0806, P14