| http://www.w3.org/ns/prov#value | - The shapes and the sizes of the pair of pump housings 26 are formed in a symmetric manner on both end portions of the electric motor 12.On both end portions of the output shaft 16 in the inner spaces of the pair of pump housings 26, a pair of axial-flow impeller units 28 are fixed by well known detachably fixing means, for example, such as nuts 29 or the like.
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