共 8 条
- [2] HARTMANN CS, 1973 ULTR S P, P423
- [3] HLADY AM, 1975, Patent No. 3916099
- [4] ISHII A, 1981 ULTR S P, P167
- [5] JOHNSON RG, 1972, Patent No. 3673327
- [6] SOLIE LP, 1979 ULTR S P, P682
- [7] STAMPS GM 178/18, 1964, Patent No. 3156766
- [8] Woo P. W., 1964, U.S. Patent, Patent No. [3 134 099, 3134099]