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21. | immediate bottom |
| 直接底板 |
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22. | electronic watch circuit disc |
| 电子表底板 |
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23. | collecting tray |
| 底板格 |
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24. | floor elevation |
| 底板高程 |
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25. | moving end plate |
| 活络底板 |
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26. | bottom slide of saddle |
| 刀架底板 |
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27. | negative matrix |
| 底板|底片 |
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28. | Outer Bottom Plating |
| 外底板 |
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29. | bottom board for textile machines |
| 纺织机底板 |
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30. | perforation plate |
| 穿孔底板 |
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