Relates to blocks in use which were supplied in conformity with Part 1 with five new grades of accuracy (0, 1, 2, 3 and 4).
Cross References: BS 4311:Part 1*BS 1133:Subsection 6.1*BS 1133:Subsection 6.2*
Cross References: BS 4311:Part 1*BS 1133:Subsection 6.1*BS 1133:Subsection 6.2*
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