| 摘要 |
In an electric filter device such as a band pass filter, a resonator having hollow tubes soldered to both outside faces is suspended in a casing by springs which engage the ends of the tubes. In multiple resonator assemblies the end resonators have hollow tubes projecting from the outside faces for attachment to the springs, and the inside faces are joined by telescoping force fit hollow tubes. In one embodiment, the resonators are of different shapes.
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