| 2911 | Conveyor Belt Repair Products | Company Product |
| 2912 | Convention Service | Company Product |
| 2913 | Converters | Company Product |
| 2914 | Convents & Monastries | Company Product |
| 2915 | Conveyor Controls | Company Product |
| 2916 | Controls | Company Product |
| 2917 | Controllers | Company Product |
| 2918 | Controller Computer Cards | Company Product |
| 2919 | Cold & Heat Insulation Contractors | Company Product |
| 2920 | Contractors: Dredging | Company Product |
| 2921 | Contract Manufacturing Service | Company Product |
| 2922 | Contour Sawing Machines | Company Product |
| 2923 | Contracers | Company Product |
| 2924 | Contamination Control Equipment & Supplies | Company Product |
| 2925 | Continental Restaurants | Company Product |
| 2926 | Containerized Freight | Company Product |
| 2927 | Container Trailers | Company Product |
| 2928 | Container Stuffing & Unstuffing | Company Product |
| 2929 | Container Handling Equipment | Company Product |
| 2930 | Contactor Relays | Company Product |
| 2931 | Contact Plate Freezers | Company Product |
| 2932 | Contact Lenses | Company Product |
| 2933 | Contact Lenses Manufacturers | Company Product |
| 2934 | Contact Lense Solution Manufacturers | Company Product |
| 2935 | Consulting Professional Engineers | Company Product |
| 2936 | Consulting Engineers | Company Product |
| 2937 | Consumer Organizations | Company Product |
| 2938 | Consumer Cooperative Organizations | Company Product |
| 2939 | Construction Site Safety Nets | Company Product |
| 2940 | Construction Pumps | Company Product |