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} |
768 | DF | .~.~ Refractory or platinum group metal or alloy or silicide thereof {2} |
770 | .~.~.~ Molybdenum, tungsten, or titanium or their silicides |