| 257 / | HD | ACTIVE SOLID-STATE DEVICES (E.G., TRANSISTORS, SOLID-STATE DIODES) | 
| 213 | DF | FIELD EFFECT DEVICE {6} | 
| 215 | DF | .~ Charge transfer device {11} | 
| 225 | DF | .~.~ Non-electrical input responsive (e.g., light responsive imager, input programmed by size of storage sites for use as a read-only memory, etc.) {6} | 
| 231 | DF | .~.~.~ 2-dimensional area architecture {2} | 
| 233 |  | .~.~.~.~ Sensors not overlaid by electrode (e.g., photodiodes) |