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Westclox Big Ben Style 4 Chime Alarm Governor Variations

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The first examples have a fiber gear driving a fan fly. Later examples have a brass gear driving a centrifugal governor.

Alarm Governor Fiber Gear and Fan Fly:

A fiber gear drives a fan fly. Used from the beginning through ca. mid-1936.

Alarm Governor Brass Gear and Centrifugal Governor.:

A brass gear drives a centrifugal governor. Used starting ca. mid-1936.
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