| 摘要 |
A lamp base may include a cylindrical body having an end surface, a first step portion and a second step portion, a first upper pin connector provided on the first step portion, a second upper pin connector provided on the second step portion, and a first and second lower pin connector provided on the end surface. Interfitting keys and recesses may also be used to insure that a lamp base is only coupled to an appropriate socket. Adapter blocks may be used to apply such recesses to an existing lamp.
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