共 8 条
[1]
KAHR K, 1952, Patent No. 939808
[2]
KRIMM H, 1952, Patent No. 953069
[3]
POHLER G, 1955, Patent No. 1008730
[4]
RUPPERT W, 1955, Patent No. 1004191
[5]
SCHMIDT W, 1940, Patent No. 872342
[6]
SCHMIDT W, 1938, Patent No. 725083
[7]
SCHMIDT W, 1939, Patent No. 727626
[8]
1903, BER DTSCH CHEM GES, V36, P701