High-frequency apparatus; dynamometers; surveying apparatus and instruments; precision measuring apparatus; electrical circuit testers; oscillographs; optical apparatus and instruments; electrical signal attenuators; switches, electric; chips [integrated circuits]; wavemeters; semi-conductor testing apparatus; spectrograph apparatus; semi-conductor testing machine; probes for testing semiconductors; laser measuring apparatus; antenna parameter measuring apparatus; tool measuring instruments; vacuum tube characteristic testers; spectrograph.