2800: Semiconductors/Memory, Circuits/Measuring and Testing, Optics/Photocopying, Printing/Measuring and Testing

• 2810 Semiconductors/Memory
• 2820 Semiconductors/Memory
• 2890 Semiconductors/Memory
• 2830 Electrical Circuits and Systems
• 2840 Electrical Circuits and Systems
• 2850 Printing/Measuring and Testing
• 2860 Printing/Measuring and Testing
• 2870 Optics
• 2880 Optics
• 2896 Search and Classification Examiner Art Unit