In the international standard classification, Le only involves: Measurement of fluid flow.
KR-KS, Le only
KS B ISO 24578-2023 Hydrometry — Acoustic Doppler profiler — Method and application for measurement of flow in open channels from a moving boat
US-CFR-file, Le only
CFR 50-622.371-2014 Wildlife and fisheries. Part622:Fisheries of the car-ibbean, gulf, and south at-lantic. Section622.371:Limited access system for commercial vessel permits for king mackerel.