E - Fixed Constructions – 02 – D
Patent
E - Fixed Constructions
02
D
94/12
E02D 29/14 (2006.01)
Patent
CA 1142009
ABSTRACT OF THE DISCLOSURE A dam structure including a water filled torus of flexible impervious material having a diameter greater than a typical manhole and a membrane extending across the central opening defined by the torus, the dam being easily portable and adapted to sit on a manhole when the case of a flood or spill so as to prevent seepage into the manhole.
359435
Sanivan Marine Inc.
Swabey Ogilvy Renault
LandOfFree
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