Patent classifications
E
FIXED CONSTRUCTIONS
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E03
WATER SUPPLY; SEWERAGE
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E03B
INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
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1/00
Methods or layout of installations for water supply
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E03B1/04
for domestic or like local supply
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E03B1/041
Greywater supply systems
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E03B2001/047
using rainwater
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