Historical
ONORM EN 771-1:2011
Specification for masonry units - Part 1: Clay masonry units (Austrian Standard)
This European Standard specifies the characteristics and performance requirements for masonry units manufactured from clay for use in masonry construction (e. g. facing and rendered masonry, loadbearing or non-loadbearing masonry structures, including internal linings and partitions, for building and civil engineering).
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Austrian Standards Institute [on]