73280709
Oct 6, 1980
Jun 15, 1982
Heavy Medium Classifiers, Heavy Medium Cyclones, Hydrocyclones, Classifying Cyclones, Sieve Bends, and Air-Flow Cleaners Used in the Processing of Coal and Minerals, and in Waste and Metals Recovery
MachineryConstruction, Repair, Servicing and Maintaining of Coal Processing Plants and Related Facilities for Others
Building Construction and RepairEngineering and Design of Coal Processing Plants and Related Facilities for Others
Computer and Scientific