| 标准编号 | IEC 60457-4:1978 |
| 标准名称 | Rigid precision coaxial and their associated precision connectors. Part 4: 21 mm rigid precision coaxial line and associated hermaphroditic precision coaxial connector - Characteristic impedance 50 ohms (Type 9/21) - Characteristic impedance 75 ohms (Type 6/21) |
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