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No TPTP formula. May not be expressible in strict first order. engineering.kif 587-587 Fourpole is a subclass of multipole
No TPTP formula. May not be expressible in strict first order. engineering.kif 590-590 Twoport is a subclass of fourpole
No TPTP formula. May not be expressible in strict first order. engineering.kif 604-604 Ideal operational amplifier is a subclass of fourpole


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