31. The performance of the sapphire concentrator was evaluated via an on-sun calorimeter test. 32. In addition, the mine and concentrator at Sijes produce mineral concentrates for direct sale. 33. For example, wet sieving angle is generally around 25 ?2 ?for concentrator . 34. Q : I have chronic obstructive pulmonary disease and use an oxygen concentrator when I sleep. 35. It includes an open-pit mine, a concentrator and two SX-EW plants. 36. One of the most common, and unsung unattended system is the humble telephone concentrator box. 37. However, an oxygen concentrator might be able to help, as it simply removes nitrogen. 38. It is, therefore, a measure of the tolerance a concentrator has to tracking errors. 39. SolSource operates as a solar concentrator . 40. At the mine site in Voisey's Bay, Inco will also build an ore concentrator .