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Timber structures. Strength graded structural timber with rectangular cross section - Machine grading; additional requirements for type testing Ingestion-build-228203 BS EN 12077-2 specifies generalWhat is this standard about? This document specifies requirements, additional to those of EN 14081 1, for type testing of machine graded structural timber with rectangular cross sections shaped by sawing, planning or other methods, and having deviations from the target sizes corresponding to EN 336. This includes requirements for strength grading machines.