(under the class definition) Apparatus comprising means for positively and at will holding the runner* enclosing housing, or a part thereof, in a selected one of a plurality of different positions in relation to a means on which the apparatus is sustained.
(1) Note. The sustaining or supporting means for the apparatus need not be claimed for this and the indented subclasses, if it is clear from the disclosure that the adjustment is relative to such a sustaining means.
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14, for control means responsive to the position of a casing*, runner* or shaft*.
