1. A model of contact resistance for a microswitch is presented.

2. Column-row addressable electric microswitch matrices can be made in large areas, with high pixel density.

3. The lighting device comprises at least a metal sleeve with a female thread, a printed circuit board, a LED, a microswitch, a spring electrode, a battery and a rear metal cover.

4. On valves controlled remotely, the position indicators may be used for microswitch contact.

5. The improvement of the technical scheme is as follows: the microswitch cover board consists of a stepped top and a vertical side connected with the side edge of the stepped top.

6. During the "15 Albert Keil Kontaktseminar", discussions were carried out on the development of microswitch in the progress of information technology.