| 摘要 |
<p>The keyboard is for electric typewriters, telex machines, calculators etc. It comprises a board with a large number of switches mounted close above or below it. A sheet of material (3) is mounted on the board (4), having a coated or embossed pattern at each switch (5), and being interchangeably accommodated in, and accurately positioned by, a holder (6). There can also be one or more second sheets (9, 10), each with a hole at each switch.</p> |
