| http://www.w3.org/ns/prov#value | - A vacuum pump as claimed in claim 1; wherein the exhaust means comprises a plurality of blades having a preselected number of rotor blades disposed at an uppermost stage thereof; and wherein the number of the guiding blades is a preselected number obtained by multiplying the preselected number of the rotor blades by its divisor or by an integer.
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