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| Number | Title | Issue Date |
| 5764705 | Adaptive phase shift adjuster for resonator The in-phase channel 28 of a complex demodulated resonator data output signal 12 should contain all of the sensed information, and the quadrature-phase channel 32 should contain none of it. This will not happen if the phase of the reference signal 14 is i... | 06/09/1998 |
