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STLB-Bau LB 060
paging-, acoustic signalling-, time service- and antenna systems, media technology
STLB-Bau LB 059
Security lighting
STLB-Bau LB 085
Trenchless pipelaying
STLB-Bau LB 057
Home and building electronic system
STLB-Bau LB 009
Underground drainage
STLB-Bau LB 000
Safety devices and building site facilities
STLB-Bau LB 001
Scaffolding work
STLB-Bau LB 003
Landscape work
STLB-Bau LB 002
Earthworks
STLB-Bau LB 005u008
Well construction works and exploratory drilling; Groundwater lowering