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In 1970, Kyoritsu claimed to have 'revolutionized' outdoor cleaning with the PB-9, a backpack power blower. The Echo brand of hand-held petrol powered tools including chainsaws, brushcutters, hedge trimmers and leaf blowers are manufactured in Yokosuka and Morioka , with other major plants in Shenzhen , China and Lake Zurich , Illinois .
Echo sounding or depth sounding is the use of sonar for ranging, normally to determine the depth of water . It involves transmitting acoustic waves into water and recording the time interval between emission and return of a pulse; the resulting time of flight , along with knowledge of the speed of sound in water, allows determining the distance ...
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