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 | AD Power Co.: - Products include standby power meters (such as Wattman HPM-100), oscilloscopes, spectrum analyzers, DC power supplies and other instruments. |
 | Rectifiers and Electronics: - Manufacturers of AC/DC high voltage and high current testing equipments, spark testers, industrial voltage stabilizers, AC and DC welding equipment, battery chargers. New Delhi, India. |
 | Vitrek: - Manufactures high potential testers for both AC and DC measurements including a complete ground safety, fault locating, and measurement systems. |
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