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a combination of a strong source of noise made in the manhole and a sensitive microphone in the toilet or other records through the lozingstoestel or stored geluidsdetectie or on the right lozingstoestel sewer is connected.
a combination of a strong source of noise made in the manhole and a sensitive microphone in the toilet or other records through the lozingstoestel or stored geluidsdetectie or on the right lozingstoestel sewer is connected.
