theorem instCoeFiatObjectPartMaterialEntity._proof_1
theorem instCoeFiatObjectPartMaterialEntity._proof_1: ∀ (v : qszr71sj.FiatObjectPart), qszr71sj.MaterialEntity.Is (Subtype.val v)
theorem instCoeFiatObjectPartMaterialEntity._proof_1
theorem instCoeFiatObjectPartMaterialEntity._proof_1: ∀ (v : qszr71sj.FiatObjectPart), qszr71sj.MaterialEntity.Is (Subtype.val v)