共 243 条
[52]
FISHEL NA, 1970, Patent No. 3515769
[53]
FISHEL NA, 1969, Patent No. 3477964
[54]
FISHEL NA, 1973, Patent No. 3763261
[55]
FLARK A, 1966, Patent No. 3281488
[56]
FOLKINS HD, 1961, Patent No. 2982803
[57]
FRANCK JP, 1974, Patent No. 2369092
[58]
FRANK J, 1973, Patent No. 147399
[59]
GABBAGE JT, 1966, Patent No. 3272878
[60]
GARRISON AD, 1949, Patent No. 2483130