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| 51. | travelling barrel pump |
| 游动泵筒式深井泵 |
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| 52. | Barrel Bar |
| 条夹板 |
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| 53. | Barrel tumbling |
| 滚筒打光 |
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| 54. | HB (Heavy Barrel) |
| 厚膛壁身管 |
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| 55. | barrel enameling |
| 转鼓涂 |
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| 56. | pickle Barrel |
| 轰炸员练习投弹用的目标 |
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| 57. | barrel throttle |
| 筒形节流阀 |
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| 58. | button barrel lamp |
| 按钮表示灯 |
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| 59. | burnishing barrel |
| 抛光滚筒 |
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| 60. | gun barrel drill |
| 炮筒钻 |
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