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| 41. | sound projector |
| 扬声器 |
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| 42. | projector mechanism |
| 投影机构 |
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| 43. | graded projector |
| 逐格放映机 |
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| 44. | ceiling projector |
| 吊装式投影机 |
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| 45. | signal projector |
| 信号发射器 |
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| 46. | trumpet projector |
| 扬声筒 |
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| | |
| 47. | continuous projector |
| 连续放映机 |
|
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| 48. | telecine projector |
| 电视电影放映机 |
|
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| 49. | rocket projector |
| 火箭发射装置 |
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| 50. | panoramic projector |
| 透视投影器|Ｘ光检查装置 |
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