type-printing telegraphs / telephone exchange / liquid contact devices / certain other systems / manufacturing apparatus / electric motor control systems / unspecified trip devices / protective devices / protective systems / gaseous and unconfined liquid media / electrodynamic trip devices / electro-dynamic trip devices / motor operating devices / electric servomotor systems / human power driving systems / electro-thermal trip devices / time delay devices / energy / /
Organization
Ohmic / National Science Foundation / National Basketball Association / National Football League / /
UKC Key, Section H: Electricity