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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 the circular.seven of the ministry of internal affairs 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 the circular.seven of the ministry of internal affairs directorate general of fire services of 2.4.1991 and according to standard uni 9723
