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Machines for the manufacture of constructional products from concrete and calcium-silicate. Safety - Pipe prestressing machines Ingestion-build-54371 Specifications and test methods enlisted1 Scope 1. 1 This part of EN 12629, taken together with EN 126291: 2000+A1: 2010, applies to pipe prestressing machines as defined in Clause 3. EN 126291: 2000+A1: 2010 specifies general requirements applicable to machines for the manufacture of constructional products from concrete and calciumsilicate. This document specifies the additional requirements to and or the deviations from EN 126291: 2000+A1: 2010 specific to the machines it covers.