Vacuum or other controlled atmosphere metallurgical melting and casting furnaces and related equipment, as follows: a. Arc remelt and casting furnaces having both of the following characteristics: 1. Consumable electrode capacities between 1000 and 20000 cm 3 ; and 2. Capable of operating with melting temperatures above 1973 K (1700 °C); b. Electron beam melting furnaces and plasma atomization and melting furnaces, having both of the following characteristics: 1. A power of 50 kW or greater; and 2. Capable of operating with melting temperatures above 1473 K (1200 °C); c. Computer control and monitoring systems specially configured for any of the furnaces specified in Item 1.B.7.a. or 1.B.7.b.