共 54 条
[41]
1937, Patent No. 2101821
[42]
1958, Patent No. 802518
[43]
1958, Patent No. 2824130
[44]
1968, Patent No. 3403079
[45]
1957, Patent No. 2780654
[46]
1958, Patent No. 2824133
[47]
1964, Patent No. 1063163
[48]
1944, Patent No. 2352641
[49]
1952, Patent No. 2602802
[50]
1965, HYDROCARBON PROCESSI, V44, P169