257 / | HD | ACTIVE SOLID-STATE DEVICES (E.G., TRANSISTORS, SOLID-STATE DIODES) |
734 | DF | COMBINED WITH ELECTRICAL CONTACT OR LEAD {14} |
741 | DF | .~ Of specified material other than unalloyed aluminum {10} |
750 | DF | .~.~ Layered {10} |
766 | .~.~.~ At least one layer containing chromium or nickel |