| 摘要 |
<p>8970 CAN In an electrical switch comprising a first sheet of transparent electrically insulating material having at least one electrical conductor on a surface thereof; a second sheet of transparent electrically insulating material having at least one electrical conductor on a surface thereof; and a spacer sheet of electrically insulating material having at least one hole therethrough r the first, second and spacer sheets being arranged in superposed relationship with the first and second sheets on opposite sides of the spacer sheet with the conductors on the first and second sheets adjacent to the spacer sheet and each aligned with at least one hole in the spacer sheet whereby by the application of pressure to the first sheet, conductors on the first and second sheets can be urged into contact through a hole in the spacer sheet, the first and second sheets are of cellulose acetate material, the conductors having been formed on the surfaces thereof by electro-deposition.</p> |
