- 451 EIP Microwave Frequency CounterCondition: UsedFrequency: 10 GHz
- 538B EIP Microwave Frequency CounterCondition: UsedFrequency: 26.5 GHz
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- 548A EIP Microwave Frequency CounterCondition: UsedFrequency: 26.5 GHz
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- 585C EIP Microwave Frequency CounterCondition: UsedFrequency: 20 GHz