ISO 9951:1993/Cor1:1994 is a corrigendum (correction) to the ISO 9951:1993 standard. Specifically, it refers to "Measurement of gas flow in closed conduits - Turbine meters" and contains a corrigendum or correction to that standard. The "Cor1" indicates it's the first corrigendum to the 1993 standard. In simpler terms, it's a technical update or clarification to the original standard for measuring gas flow with turbine meters.
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