Mittal Enterprises, New Delhi, (Manufacturers of Ultrasonic Interferometer For Liquids, Ultrasnoic Interferometer For Solids, Plancks Constant Kit, Universal B-H Curve Tracer, Curie Temperature Kit (For Ferroelectric) , Dielectric Constant Kit, Dipolemeter, Forbidden Energy Gap Kit, Fourier Analysis Kit, Lattice Dynamics Kit, B-H Curve Unit, Stefans Constant Kit , Boltzman Constant Kit, Capacitance and Permittivity Kit , Laser Experiment Kits , Fiber Optic Apparatus, Abbe Refrectometers)