Electrical and scientific apparatus, namely, shaker test systems consisting of electro-dynaxnic shakers and power amplifiers, and parts therefore; electro-dynamic,inertial, modal hydraulic and linear motor shakers, all for use in testing industrial, electronic and electromechanical components and parts; shaker accessories, namely, bases, slip tables, head expanders and fixtures; and power amplifiers; all for use in testing industrial, electronic and electromechanical components and parts

installation, repair and maintenance of electrical and scientific testing equipment