Explain the connection and control the lighting from the most place

The divatory switch, also known as the end-switch, is used to light or extinguish a lamp or carry it from two or three places or four places
If you need to control a lamp from more than one place:
For example, in the case of long roads means to turn the lights on and off, so as not to disturb the roads with another key or vice versa
In the case of peace, for example, I have two houses. I need to light the ladder from a key located at the entrance to the house. I can see the ladder and need a cold. I can light the staircase from the second floor ... and it is possible to have three floors that still need three keys. From any role ... and possible as a violin I need four keys to be filled and set out of four roles and a Bacon substitute for the peace machine
In the case of a room in a house and the room has more than one door meant to serve as a corridor for a larger room .. In the case he needs two keys so that the key at each door and I can operate and dispense light from any key of them
Or any other cases you need to control pregnancy from more than one place
Here is an explanation of two cases .. Control of two places and three places

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