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  MechanicalProductAttribute
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| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 30983-30983 | MechanicalProductAttribute 是 行业属性 的 instance |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 30984-30984 |
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