共 10 条
[3]
DANFORTH JD, 1955, Patent No. 2720550
[5]
MURRAY PB, 1959, Patent No. 2877677
[6]
STONE CM, 1947, Patent No. 2418374
[7]
STRINGER RF, 1961, Patent No. 2971035
[9]
VADEKAR M, IN PRESS
[10]
1966, Patent No. 3299155