Abstract: A liquid supplying device includes: a first liquid supplying element, a second liquid supplying element inside the first liquid supplying element, a first driving element connecting to the first liquid supplying element, and a second driving element connecting to the second liquid supplying element. The first liquid supplying element contains a first liquid, and the second liquid supplying element contains a second liquid. Therein the first driving element and the second driving element selectively control the first liquid or the second liquid to spray out from the liquid supplying device. A method of using a liquid supplying device is also provided.

Abstract: An exhaust gas charger for a vehicle engine which includes an exhaust pipe with narrow openings at both ends thereof and a wide center cavity, an inner pillar at the axis of the pipe, a circular body, a wind skirt, a plurality of tension springs and a plurality of pulling rods, characterized in that the exhaust pipe is formed from the inner pillar having one end being mounted with a top tube and the other end is mounted with a rear tube such that the top tube and the rear tube are engaged with each other and a spring suspension hook is positioned at the engaging area of the two tubes and the circular body is positioned at the interior of the top tube and has a larger size than the opening of the top tube.

Abstract: A multi-functional car-top carrier device is provided herein. The car-top carrier device mainly contains a pair of railing member, each having a number of end-to-end rails. The inner rails support a number of base boards for storage and sleeping. The top rails support a number of foldable posts for raising a top board and mosquito nets. The outer rails support bicycle support members which can be pulled out and slanted on the ground for the easy loading and unloading of bicycles. A foldable ladder is attached to a bicycle support member.