Patent classifications
E
FIXED CONSTRUCTIONS
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E01
CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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E01F
ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
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5/00
Draining the sub-base; , i.e. subgrade or ground-work, e.g. embankment; of roads or; of the; ballastway of railways; or draining-off road surface or ballastway drainage; by trenches, culverts, or conduits; or other specially adapted means
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E01F5/005
Culverts; ; Head-structures for culverts, or for drainage-conduit outlets in slopes
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