| http://www.w3.org/ns/prov#value | - In order that the invention may be clearly understood, an example of it for dispensing a mixture of petrol (gasoline) as the basic liquid and oil as added liquid, will now be described with reference to the accompanying drawing, in which: Fig. l is a vertical sectional elevation of the principal pump arrangement, Fig. 2 is a horizontal sectional elevation on the line AA in Fig. 1 and Fig. 3 is a d
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