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51. | quenched spark transmitter |
| 熄灭式火花发报机 |
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52. | electric spark drilling |
| 电火花穿孔 |
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53. | electric spark machinery |
| 电火花加工机床 |
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54. | magnetic spark spectrometer |
| 磁火花谱仪 |
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55. | electrical spark alloying |
| 电火花冶制合金 |
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56. | filmless spark chamber |
| 无底片火花室 |
|
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57. | coaxial spark-gap |
| 共轴火花隙 |
|
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58. | modifier spark advance |
| 发火提早装置 |
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59. | acoustic spark chamber |
| 声学火花室 |
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60. | magneto spark advance |
| 磁电火花提前 |
|
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