Patent classifications
E
FIXED CONSTRUCTIONS
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E03
WATER SUPPLY; SEWERAGE
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E03C
DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
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1/00
Domestic plumbing installations for fresh water or waste water; Sinks
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E03C1/02
Plumbing installations for fresh water
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E03C1/10
Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
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E03C1/104
using a single check valve
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