共 7 条
[1]
E I DUPONT NEMOURS C, 1937, Patent No. 816024
[2]
FREY, 1939, Patent No. 2154444
[3]
HARMON, 1940, Patent No. 2190836
[4]
MARVEL, 1939, Patent No. 2169364
[5]
RYDEN, 1937, J AM CHEM SOC, V59, P1014
[6]
WILDER, 1939, Patent No. 2146276
[7]
[No title captured]