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| Under-side of the "keyboard" with the metallic pieces going into the wheel stubs. The left metallic bar slides down (here to the right) to reset the digits to zero. | |
| Total images: 18 | Help | |
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| Under-side of the "keyboard" with the metallic pieces going into the wheel stubs. The left metallic bar slides down (here to the right) to reset the digits to zero. | |
| Total images: 18 | Help | |