(under the class definition) Device provided with means to optionally advance material either in one longitudinal* direction or in an opposite longitudinal* direction.
(1) Note. The patents in this and indented subclasses disclose more than a mere retraction or retrograde movement such as is found in the patents of subclass 143 below. In this subclass (49) the patents disclose the totality of material-movement to be alternatively selectable either in one direction or the reverse direction, whereas the patents of subclass 143 disclose the normal operation of the device to be a two-stage advancing comprising (1) a forward movement of material beyond a point on the device and (2) a retraction movement of the material relative to the point whereby the totality of material-movement is in one direction only.
SEE OR SEARCH CLASS
112, Sewing, appropriate subclasses, especially
316, and 317 for a reversible feed for a sewing machine.
352, Optics: Motion Pictures,
124, for motion picture apparatus with provisions for film rewind, and subclass 173 for motion picture apparatus with selectively reversible film feed.
