| 摘要 |
PURPOSE:To remove projections for fitting an incoming pilot lamp from a main telephone set and to make the design simple by boring a hole in the upper part of the front surface of the telephone set and fitting a neon lamp with a lens cover. CONSTITUTION:The hole is bored in the upper part of the front surface of the telephone set and the fluorescent neon lamp 2 is fitted there. The transparent lens cover 1 is provided. The neon lamp is connected to a trunk line in series with a 4kQ resistance. This structure enables even a simple and small neon lamp to illuminate brightly.
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