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Hydrogen Technologies Standards form the basic framework for market ramp-up
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Climate change Standards and specifications support climate targets
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Smart Farming Standards and specifications are drivers for the digitalization of agriculture
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Publications of ISO/TC 22/SC 34/WG 4

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ISO 6624-1	2017-04	Standards	Internal combustion engines - Piston rings - Part 1: Keystone rings made of cast iron More	Order from DIN Media
ISO 6624-2	2016-02	Standards	Internal combustion engines - Piston rings - Part 2: Half keystone rings made of cast iron More	Order from DIN Media
ISO 6624-3	2017-04	Standards	Internal combustion engines - Piston rings - Part 3: Keystone rings made of steel More	Order from DIN Media
ISO 6624-4	2016-02	Standards	Internal combustion engines - Piston rings - Part 4: Half keystone rings made of steel More	Order from DIN Media
ISO 6625	1986-08	Standards	Internal combustion engines; Piston rings; Oil control rings More	Order from DIN Media
ISO 6626	1989-07	Standards	Internal combustion engines; piston rings; coil-spring-loaded oil control rings More	Order from DIN Media
ISO 6626-2	2013-08	Standards	Internal combustion engines - Piston rings - Part 2: Coil-spring-loaded oil control rings of narrow width made of cast iron More	Order from DIN Media
ISO 6626-3	2019-09	Standards	Internal combustion engines - Piston rings - Part 3: Coil-spring-loaded oil control rings made of steel More	Order from DIN Media
ISO 6627	2022-02	Standards	Internal combustion engines - Piston rings - Expander/rail oil-control rings More	Order from DIN Media

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