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