ISO 1607-1:1980 Positive-displacement vacuum pumps; Measurement of performance characteristics; Part 1 : Measurement of volume rate of flow (pumping speed)
1993ISO 1607-1:1993 Positive-displacement vacuum pumps; measurement of performance characteristics; part 1: measurement of volume rate of flow (pumping speed)
1980ISO 1607-1:1980 Positive-displacement vacuum pumps; Measurement of performance characteristics; Part 1 : Measurement of volume rate of flow (pumping speed)