(under the class definition) Apparatus wherein the impeller* includes means supplemental to the main attaching means for (1) securing the working members* to a hub or shaft or (2) attaching the working members to one another.
(1) Note. The lashing or attaching means is usually of limited axial extent and the flow confining function thereof is questionable. An attaching means which extends axially so that it would confine or direct a fluid is excluded from this subclass; see search note following.
SEE OR SEARCH THIS CLASS, SUBCLASS:
179+, for an axially extending shroud or web which confines fluid even though not so disclosed, but is inherent in the structure.
