DavidB4-bot
→top: clean up & uniformity
19:30
KevinDavis
added origin of the term
15:55
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Aschlafly
wiiify
01:48
+4
New page: '''Sonar''' is a system that transmits and receives sound waves underwater in order to locate submerged objects, such as submarines, or detect the distance to the coral reefs and other und...
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