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ISO 21018-1:2008WithdrawnHydraulic fluid power — Monitoring the level of particulate contamination of the fluid — Part 1: General principlesInternational Standard · Published 16 Apr 2008 · ISO/TC 131/SC 6ISO 23369:2021WithdrawnHydraulic fluid power — Multi-pass method of evaluating filtration performance of a filter element under cyclic flow conditionsInternational Standard · Published 16 Jun 2021 · ISO/TC 131/SC 6