| http://www.w3.org/ns/prov#value | - will be understood that a suitable insulating cooling medium, such as air, may be forced under pressure through the tubular inner conductor 64:: of the stub 64 from the exterior, whereby the air noted will pass downwardly in the tubular inner conductor 37:: of the trunk 37 below the plug 66 and out of the opening 370 provided in the lower end of the tubular inner conductor 37a.
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