| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) | |
|---|---|
| 01/1976 | |
| 01/27/1976 | US3935437 Signal processor |
| 01/13/1976 | US3932814 Heterodyne receiver system |
| 01/13/1976 | US3932737 Spectrum analyzer establishing a nonlinear frequency distribution of power-density spectra |