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Joe uses an electronic
listening device called a sonoscope
leak detector
listening device called a sonoscope
leak detector
Full Transcript
00:00:01.000 --> 00:00:03.055
Joe uses an electronic
listening device
00:00:03.552 --> 00:00:06.692
called a sonoscope
leak detector.
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Movie Summary
An up-close look at the heroes that keep America's sewer systems running.