Assertion: mechanical stopwatch | /r/HasProperty | powered by mainspring
Facets:
Source sentences:
text: Mechanical stopwatches are powered by a mainspring, which must be periodically wound up by turning the knurled knob at the top of the watch.
text: Mechanical stopwatches are powered by a mainspring, which must be periodically wound up by turning the knurled knob at the top of the watch.
text: Mechanical stopwatches are typically analog in style (with hands and a traditional clock face) and are powered by a mainspring that must be wound in order for the device to run.