Profile: Greenstone USA, Inc. specializes in vacuum industry. We manufacture vacuum tubes, vacuum capacitor, vacuum interrupters, vacuum relays, broadcasting vacuum tubes, ham radio vacuum tubes, audio vacuum tubes, CW magnetrons and aluminum extruded heat sinks. Our industrial vacuum tubes are used for applications such as RF sealing, RF welding, plasma etching, microwave, wood gluing and semiconductor. We offer vacuum capacitors, which are applicable in plasma deposition and etching equipment for the semiconductor industry, flat panel display & data storage, plasma fusion, high frequency generators for drying/sealing and antenna tuning units or couplers. Our manufacturing capabilities include machining, surface treatment and custom manufacturing of heat sink & finishes including nickel plating, electro less nickel and hard coat anodizing.