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Combined flexible materials for electrical insulation - Part 3: Specifications for individual materials (IEC 60626-3:2008 + A1:2012) (english version)
Laminated pressboard for electrical purposes - Part 3: Specifications for individual materials - Sheet 1: Requirements for laminated precompressed pressboard, Types LB 3.1A.1 and 3.1A.2 (IEC 60763-3-1:2010) (english version)