A lockable retractable locating frame of a BGA on-top test socket includes a push-and-lock mechanism that further comprises an accommodation room, a slider, and a sliding slot for riding the slider. In order to provide an improved toothbrush which cleans the teeth more effectively and at the same time more gently, it is provided according to the invention that the wings form a wedge, by being connected together at one end and distanced from each other at the other end. Use of their diluted solutions, in particular for the lubrication of bottles on conveyor lines. A third enhancement allows the user to view an manipulate the feed in an independent display window. The first arc discharge heating is performed between discharge electrodes positioned rearward of the end surface of the holey optical fiber. The method includes the steps of sequentially forming a gate dielectric layer, a poly-silicon layer, a titanium layer, and a WNX layer on a semiconductor substrate, carrying out a rapid thermal annealing in a nitrogen ambient, forming a silicon nitride layer on the tungsten layer, and patterning the multilayer thin-film structure into a predetermined configuration.