Abstract: The invention presents a cleaning system for stubborn stains such as dress-shirt collar and sleeve edges comprising a motorized wheel brush, a pressure roller to press clothing item against the rotating brush, a roller pressure adjustment assembly, and a cleaning-solution container under the brush to make the brush partially submerged in the solution. The proposed system eliminates manual brushing currently performed on stubborn stains, resulting in a much improved cleaning quality and reduced labor costs.

Abstract: A collar cleaning system for dress shirts comprising a slide plate, a guiding plate, a pressured soap-water spraying subsystem and a rotating brush is presented. The shirt collar is loaded onto the sliding plate and moved under the rotating brush while being sprayed with soap water to remove the dirt ring around the collar.

Abstract: A Go board with generalized topology and rules are presented. The board topology is generalized to include concave corner points, vacuous areas, two-dimensional grids over the surface of three-dimensional objects, grids consisting of three-dimensional meshes, a random graph, and temporarily invisible areas of the Go board. The Go playing rule is also generalized by allowing a player to place multiple stones, and by assigning different scores to different points on the Go board.

Abstract: A collar cleaning system for dress shirts comprising a slide plate, a guiding plate, a pressured soap-water spraying subsystem and a rotating brush is presented. The shirt collar is loaded onto the sliding plate and moved under the rotating brush while being sprayed with soap water to remove the dirt ring around the collar.

Abstract: A tricycle which includes a pivotal handlebar about a handlebar sprocket, a drive chain rotating through sprockets disposed along a T-shaped configuration, a pair of front steering wheels, a single driven rear wheel, and a cargo basket attached to a beam member over the pair of front steering wheels, whereby, upon the upward and downward movement of the handlebar, the pair of steering wheels smoothly turn in the left or the right direction in a narrow space without shaking the cargo basket attached to the tricycle.