Patent classifications
E
FIXED CONSTRUCTIONS
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E01
CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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E01C
CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
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13/00
Pavings or foundations specially adapted for playgrounds or sports grounds;; Drainage, irrigation or heating of sports grounds
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E01C13/10
for artificial surfaces for outdoor or indoor practice of snow or ice sports
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E01C13/12
for snow sports; , e.g. skiing or ski tow track
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