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• Dreier, H.
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  German Standards, Safety Regulations and PTB Approval Requirements for Explosion Protected Electrical Equipment.
  Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, West Germany
  Monograph 113
  Monograph 113
  Instrument Society of America (ISA). Electrical Safety Practices. Monograph 113. November 1971, Wilmington, DE, McKinney, A. H., Editors, 97-101 p., 1971