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sweep-sec·ond hand | \ ˈswēp-ˌse-kənd- 
, -kənt- \
, -kənt- \Definition of sweep-second hand
: a hand marking seconds on a timepiece mounted concentrically with the other hands and read from the same dial as the minute hand
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Time Traveler for sweep-second hand
The first known use of sweep-second hand was in 1937
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