| (subclass TranslatoryTwopole PureTwopole) | engineering.kif 569-569 | 翻译双极 是 纯双极 的 subclass |
| (subclass DamperElement TranslatoryTwopole) | engineering.kif 574-574 | 阻尼元件 是 翻译双极 的 subclass |
| (subclass Inertor TranslatoryTwopole) | engineering.kif 579-579 | Inertor 是 翻译双极 的 subclass |
| (subclass SpringElement TranslatoryTwopole) | engineering.kif 584-584 | 弹簧元素 是 翻译双极 的 subclass |
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