| 1. To disconnect a wire from "the minus" plug of the storage battery. |
| 2. To wring out a screw-driver cautiously spring clip towards a plafond and to take out a plafond. |
| 3. To replace a lamp. |
| 4. To establish a plafond into place, having entered at first a ledge from outside the switch, and to latch a plafond, having pressed it to a ceiling. |
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