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A method for manufacturing vias in a silicon wafer, the silicon wafer having a crystal orientation, and having a plane that is perpendicular to a surface of the wafer, tilted by 35.26°, the method comprising the steps of providing a mask having a rhomboidal-shaped opening onto a surface of the silicon wafer, such that edges of the rhomboidal-shaped opening line up with a plane of a crystalline structure of the silicon wafer, etching a hole in the silicon wafer at the rhomboidal-shaped opening, and polishing the hole after the etching by a anisotropic etching.
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