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What is BS 3221-1 - Medicine measures specification about
hydrofluoracid and bromide liquids
Manufacturers of adjustable furniture used for storage systems
and wall thicknesses and mechanical properties in accordance with ISO 3305
Respiratory protective devices: threads for facepieces - Thread connection M 45 x 3 Ingestion-build-159183 What is BS 3221-1 -1 Scope This European Standard is applicable to self contained compressed air breathing apparatus designed as positive pressure breathing apparatus. This European Standard specifies a thread connection, M 45 x 3, which may optionally be used for facepieces for positive pressure breathing apparatus. This European Standard does not apply to negative pressure breathing apparatus, to closed circuit breathing apparatus or to diving equipment.
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