Explosive atmospheres. Part 37. Non-electrical equipment for explosive atmospheres. Non electrical type of protection constructional safety 'c', control of ignition source 'b', liquid immersion 'k'
Safety of household and similar electrical appliances. Part 2.49. Particular requirements for commercial electric appliances for keeping food and crockery warm
Manganese ores, concentrates and agglomerates. Methods of sampling and preparation of samples for chemical analysis and determination of moisture content
