# Portable Low-Frequency Noise Reduction Device for Both Small Open and Closed Spaces

> Research article (Shock and Vibration, 2016) · cited 10× · AI/ML

**Wikidata**: [openalex:W1961378879](https://www.wikidata.org/wiki/openalex:W1961378879)  
**Source**: https://4ort.xyz/entity/portable-low-frequency-noise-reduction-device-for-both-small-open-and-closed-spaces