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Kiesfilter n
gen.	gravel packed filter; gravel-packed filter; sand filter
construct.	gravel envelope; gravel jacket; gravel pack
met.	pebble filter
mining.	gravel packing (Pumpbrunnen)
tech.	gravel filter
water.suppl.	graveller

Kiesfilter: 1 phrase in 1 subject

Natural resourses and wildlife conservation

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