首页>
外国专利>
method and apparatus for lighting original hard and steadily and uniformly the totality of space surrounding a light source through a single light beam focusingta and condensed by a projector rotating on its axis at high periodicity.
method and apparatus for lighting original hard and steadily and uniformly the totality of space surrounding a light source through a single light beam focusingta and condensed by a projector rotating on its axis at high periodicity.