共 24 条
- [21] HIGH-FREQUENCY CRYSTAL UNITS FOR PRIMARY FREQUENCY STANDARDS [J]. PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS, 1952, 40 (09): : 1030 - 1033
- [22] Wendt KR., 1943, P IRE, V31, P7, DOI [10.1109/JRPROC.1943.232382, DOI 10.1109/JRPROC.1943.232382]
- [23] 1950, RECENT DEV COLOR SYN
- [24] 1952, M PANEL 14 NTSC