National Geographic NG751 Series, Инструкция по эксплуатации

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4) Measuring time by cycle
- Press push button A to start
the chronograph.
- Press push button B to freeze
the display. The chronograph
keeps running. The display
indicates the time elapsed
since the chronograph was
first stopped.
- Press push button B for more
than one second. The
chronograph still runs, but the
elapsed time is reset.
- Press push button B to
display the new elapsed time.
- Press push button A to stop
the chronograph.
D
B
C
A
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