Particular Sensor Structure Patents (Class 235/439)
- Light level control (Class 235/455)
- Multiple column code (Class 235/456)
- Holographic (Class 235/457)
- Perforated record (Class 235/458)
- Bar code (Class 235/462.01)
- Invisible (Class 235/468)
- Color coded (Class 235/469)
- With scanning of record (Class 235/470)
- Hand-held (e.g., portable) (Class 235/472.01)
- Light pipes (Class 235/473)