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A single spring unit includes a multi-helical spring formed of composite material. The single spring unit includes multiple layers of composite material disposed in a first helical configuration, and multiple layers of composite material in a second helical configuration interwoven with one another,

A single spring unit includes a multi-helical spring formed of composite material. The single spring unit includes multiple layers of composite material disposed in a first helical configuration, and multiple layers of composite material in a second helical configuration interwoven with one another, and coupled together to form the single spring unit.

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A single spring unit includes a multi-helical spring formed of composite material. The single spring unit includes multiple layers of composite material disposed in a first helical configuration, and multiple layers of composite material in a second helical configuration interwoven with one another,

A single spring unit includes a multi-helical spring formed of composite material. The single spring unit includes multiple layers of composite material disposed in a first helical configuration, and multiple layers of composite material in a second helical configuration interwoven with one another, and coupled together to form the single spring unit. erature, a comparator having an output which changes state when the magnitude of the sensor signal exceeds a temperature-equivalent signal corresponding to a stored digital value, and a control unit for setting the stored digital value corresponding to a desired trip temperature.