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Reference.org
Flip clock
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<p>A flip clock (also known as a "flap clock") is an electromechanical, <a href="/facts/Digital_clock/1D1xwaob">digital</a> timekeeping device which displays the time through a <a href="/facts/Split-flap_display/UI3pQ744">split-flap display</a>, where numbers are revealed by flipping or rotating a series of plates or leaves. </p>