Petroleum and natural gas industries. Drilling and production equipment. Inspection, maintenance, repair and remanufacture of hoisting equipment. General technical requirements
Fertilizers. Determination of ammoniacal nitrogen content in presence of other substances which release ammonia when treated with sodium hydroxide. Titrimetric method
Sand and gravel material from loose mountain rocks for the production of sand, sand and gravel mixture, gravel and crushed stone. General specifications
