# A Hierarchical Feature Extraction Model for Multi-Label Mechanical Patent Classification

> Research article (Sustainability, 2018) · cited 48× · AI/ML

**Wikidata**: [openalex:W2786979006](https://www.wikidata.org/wiki/openalex:W2786979006)  
**Source**: https://4ort.xyz/entity/a-hierarchical-feature-extraction-model-for-multi-label-mechanical-patent-classification