(under subclass 161) Device in which the standard or the part which it moves relative to has a series of vertically spaced apertures or grooves, and the other part carries a detent selectively engageable with one of the apertures or grooves to hold the parts in adjusted position.
SEE OR SEARCH THIS CLASS, SUBCLASS:
423, for a vertically adjustable nonstandard type stand which is held in adjusted position by a notch or cavity engaging