Abstract: A method of manufacturing a muffler assembly is provided that includes the step of cutting a pipe to a length that is slightly longer than that of a muffling device. The method includes the step of forging a lower end of the pipe to form an exhaust pipe. Then, the muffling device is spirally wound and inserted in a middle portion of the pipe. An upper end of the pipe is then forged and formed as an inlet pipe. The method also includes the step of forging the inlet pipe and the exhaust pipe again to hold the muffling device in place in the middle portion of the pipe.

Abstract: A seamless mouse comprising a base, with an embedding unit at the rear of the base, a coupling unit in it, a pair of activating troughs near its front, a touch switch in the activating trough, to receive command from the touch operation; and a top cover, at the rear of the top cover and opposite the embedding unit being a joining pin to insert into the embedding unit for fastening purpose, inside it and opposite the coupling unit being a coupling post to couple with the coupling unit, at its front and opposite the activating trough being a driving lever, and extending from the top cover itself being the formation of at least one push key. When the top cover is assembled to the base, the joining pin is fastened to the embedding unit, the coupling post is fastened to the coupling unit. When the push key is pressed, the driving lever activates the touch switch in the activating trough, to serve the function of the mouse.