139 规格参数
| Bulb Style | t (tubular) |
| Emitted Light Characteristic | colorless |
| Bulb Light Transmission Characteristic | transparent |
| Filament Designation | c-2r |
| Voltage Rating | 5.000 volts nominal |
| Bulb Designator | t-1 |
| Overall Length | 0.250 inches maximum |
| Burning Position | any acceptable |
| Rated Average Life | hours |
| Light Output Rating | 0.030 spherical candlepower nominal single rating |
| Current Rating For Which Designed | 0.030 amperes nominal |
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