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open caisson
construct.	offener Senkkasten; Senkbrunnen m; absenkbarer Ausbau
mining.	Senkkörper m (beim gewöhnlichen Senkschachtverfahren)
open caissons
construct.	offene Senkkästen

open caisson: 8 phrases in 3 subjects

Construction	4
Natural resourses and wildlife conservation	1
Transport	3