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| 51. | Reciprocating internal combustion engines--Fire protection |
| GB/T4556-1984往复式内燃机防火 |
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| 52. | valve mechanism of internal combustion engine |
| 内燃机配气机构 |
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| 53. | service life of internal combustion engine |
| 内燃机寿命 |
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| 54. | motor outboard internal combustion for boat |
| 轴向或径向活塞原动机 |
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| 55. | dynamo ,electrical, for internal combustion engines |
| 内燃机用地直流发电机 |
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| 56. | a four - cycle internal - combustion engine. |
| 四冲程内燃机 |
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| 57. | engine ,piston, internal combustion, for tractors |
| 牵引车用活塞内燃机 |
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| 58. | internal combustion engine driven paint sprayer |
| 内燃式无气喷射机 |
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| 59. | filter oil for internal combustion engines |
| 内燃机滤油器 |
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| 60. | engine ,petrol, internal combustion, for aircraft |
| 石油内燃机,航空用 |
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