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ÖNORM B 2203-1:2001-12
Действует
Underground works - Works contract - Part 1: Cyclic driving (conventional tunnelling)
ÖNORM B 2110:2013-03
Действует
General conditions of contract for works of building and civil engineering construction - Contract to provide services
ÖNORM B 2203-2:2005-01
Действует
Underground works - Works contract - Part 2: Continuous driving (TBM tunnelling)