Abstract: A locking device integrated in a control knob, a control device, a valve and the like, configured to rotate with respect to a seating therebeneath and having a latching device that includes a latch plate configured to slidingly reciprocate within a housing inside the control knob. The latch plate has a tongue appended thereto and protruding therebeneath for releasably engaging a slot in the seating, such that when the latch plate is in the outer position, the tongue engages the slot and latches the control knob preventing its rotation with respect to the seating, and when the latch plate is in the inner position, the tongue is disengaged from the slot and is unlatched from the control knob, allowing its rotation with respect to the seating.

Abstract: A composite abrasive nonwoven web is prepared by passing fibers through a card to yield a pre-bond web following by the bonding of the pre-web in a calender to achieve a composite abrasive nonwoven web. The composite abrasive nonwoven web may be manufactured in, for example, one or two stages. The produced composite web may have at least two layers where, for example, one layer is an absorbent smooth layer and another layer is a rough abrasive layer.