Dual-purpose lamp holders with a screw connection body and a bayonet then, in parallel to the two ground body wire. I.e. can use screw incandescent bulbs, and can also use a bayonet incandescent bulb holders. Changed the traditional lamp a manner, both to increase its use, and will not increase the cost of production. In addition, for safety, in parallel between the conductor and two electrical contacts of the connecting body also equipped with a changeover switch. To prevent the hand accidentally touched the idle pick vivo electric shock phenomenon.
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