| 摘要 |
The card (1) is held in a hollow in the back surface of a metallic support plate (2). A stud (8) is attached to the top of the back surface of the plate. It is wider at its free end which projects outwards. The card is supple and is bent to fit it into the hollow and under the stud. The stud holds the card against the lower edge (3) of the hollow and against its inner surface.
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