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ONORM EN 4551:2015
Aerospace series - Pipe coupling, 37°, in heat resisting steel - Swivel nuts - Inch series (Austrian Standard)
Specifies the methods of sampling, sample preparation and sieve analysis for the determination of the size distribution in a consignment or a lot af all types of ferroalloys of particle size equal to or greater than 40 m.
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Austrian Standards Institute [on]
