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Priority to IT08200590ApriorityCriticalpatent/IT1243639B/en
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Publication of IT1243639BpublicationCriticalpatent/IT1243639B/en
IT08200590A1990-07-171990-07-17Device to make the drains in general airtight and in particular those on the street during the absence of any drain water
IT1243639B
(en)
DEVICE FOR MAKING THE TUNNELS PARTIALLY HERMETIC IN GENERAL IN THE ABSENCE OF WASTE WATER, TO PREVENT THE SPILLING OF BAD ODORS AND HARMFUL INFECTIOUS BEINGS