Electro-optics/Laser 78 Conference and Exposition Electro-Optics/Laser 77 Conference and Exposition IEEE Applied Power Electronics Conference and Exposition Powder Metallurgy Conference and Exhibition Quartz Devices Conference and Exhibition 11th Electron-Optics/Laser Conference and Exposition,Boston,1978. International Electrical,Electronics Conference and Exposition Cleveland Electrical/Electronics Conference and Exposition,1980 Electro-Optics/Laser Conference and Exposition,Anaheim,1977. Energy-Sources Technology Conference and Exhibition