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| 51. | window envelope |
| 开窗信封(正面部分透明, 可见信纸上的收信人的地址) |
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| | |
| 52. | cable sheathing |
| 缆索外壳 |
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| | |
| 53. | boiler enclosure |
| 锅炉外壳 |
|
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| | |
| 54. | Temperature envelope |
| 温度范围 |
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| | |
| 55. | case, for alarm clocks |
| 闹钟外壳 |
|
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| | |
| 56. | monolithic case |
| 整体外壳 |
|
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| | |
| 57. | casing for pendulum clock |
| 摆钟外壳 |
|
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| | |
| 58. | envelope roulette |
| 旋动包络 |
|
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| | |
| 59. | package assembly |
| 外壳组装 |
|
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| | |
| 60. | R.F. envelope |
| 射频脉冲宽度 |
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