protection valve

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• Valve oil — is a lubricant for valves of brass instruments. It is typically comprised mostly of mineral oil with a small amount of other ingredients. Use of valve oil Besides lubricating the moving parts of the valve, valve oil provides corrosion protection… …   Wikipedia

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• Train protection system — A train protection system is a railway technical installation to ensure safe operation in the presence of human failures. Development Train stops Main article: Train stop The earliest systems were train stops, as still used by the New York Subway …   Wikipedia