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| 874.77 | Capacitance bridges | |
| 874.77 | Gain-measuring instruments for telephone circuits | |
| 874.77 | Impedance bridges | |
| 874.77 | Indicators, fading, for radio- or telecommunications | |
| 874.77 | Indicators, peak, for radio- or telecommunications | |
| 874.77 | Indicators, transmission level, for radio- or telecommunications | |
| 874.77 | Inductance bridges | |
| 874.77 | Interference-measuring instruments for telephone installations | |
| 874.77 | Measuring apparatus, used especially in telecommunications for measuring or checking electrical quantities | |
| 874.77 | Meters, crosstalk, for telephone circuits | |
| 874.77 | Meters, decibel | |
| 874.77 | Meters, distortion factor | |
| 874.77 | Meters, echo | |
| 874.77 | Meters, noise level, for radio- or telecommunications | |
| 874.77 | Nepermeters | |
| 874.77 | Psophometers | |
| 874.77 | Testers, impedance | |
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