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| Number | Title | Issue Date |
| 5191220 | Flame monitoring apparatus and method having a second signal processing means for detecting a frequency higher in range than the previously detected frequencies The presence of a burner flame, in a multiple burner installation, is monitored by sensing a signal indicative of the spectrum of the fluctuating component in the radiation of the flame over a range of frequencies. In the lower frequency range a measure i... | 03/02/1993 |
