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system for the production of shapes and accessories suitable for the construction of a fire-resistant door frames for use as firebreaks according to circular no 7 of the ministry of the interior, directorate general of fire services of 2.4.1991 and according to standard uni 9723
system for the production of shapes and accessories suitable for the construction of a fire-resistant door frames for use as firebreaks according to circular no 7 of the ministry of the interior, directorate general of fire services of 2.4.1991 and according to standard uni 9723