Six Second Mechanical Stopwatch | This Naval stopwatch was originally designed by Marathon to tell a sonar operator how far away a submarine is, based on the time the sonar ping takes
![Electronic Digital Stopwatch 6 Seconds Stock Illustration - Illustration of numerical, button: 117579619 Electronic Digital Stopwatch 6 Seconds Stock Illustration - Illustration of numerical, button: 117579619](https://thumbs.dreamstime.com/z/electronic-digital-stopwatch-seconds-isolated-gray-background-stopwatch-icon-set-timer-icon-time-check-seconds-timer-seconds-117579619.jpg)
Electronic Digital Stopwatch 6 Seconds Stock Illustration - Illustration of numerical, button: 117579619
![6 seconds Countdown Timer icon set. time interval icons. Stopwatch and time measurement. Stock Vector illustration isolated Stock Vector Image & Art - Alamy 6 seconds Countdown Timer icon set. time interval icons. Stopwatch and time measurement. Stock Vector illustration isolated Stock Vector Image & Art - Alamy](https://c8.alamy.com/comp/2BCX0DD/6-seconds-countdown-timer-icon-set-time-interval-icons-stopwatch-and-time-measurement-stock-vector-illustration-isolated-2BCX0DD.jpg)