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Oliver Davis——Works at the International Criminal Court, Lives in The Hague, Netherlands.
2 Stage or 1 Stage Pump Design. Oil sealed
rotary vane pumps generally come in either 2 or 1 stage design. In most cases a 2 stage pump will go down below 1 micron .001mm mercury vacuum. A single stage pump is generally specified out at less than 15 micron .015mm mercury vacuum.
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