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- [46] HOW TO SELECT ULTRA-HIGH VACUUM VALVES SEMICONDUCTOR PRODUCTS AND SOLID STATE TECHNOLOGY, 1966, 9 (02): : 40 - &
- [49] Vacuum tube electronics at ultra-high frequencies BELL SYSTEM TECHNICAL JOURNAL, 1934, 13 : 59 - 101
- [50] ELECTROMAGNETICALLY OPERATED ULTRA-HIGH VACUUM VALVE REVIEW OF SCIENTIFIC INSTRUMENTS, 1956, 27 (08): : 657 - 657