| 335932 |
Transmission pole and line hardware manufacturing |
| 335991 |
Brush blocks, carbon or molded graphite, manufacturing |
| 335991 |
Brushes and brush stock contacts, electric, carbon and graphite, manufacturing |
| 335991 |
Brushplates, carbon or graphite, manufacturing |
| 335991 |
Carbon electrodes and contacts, electric, manufacturing |
| 335991 |
Carbon specialties for aerospace use (except gaskets) manufacturing |
| 335991 |
Carbon specialties for electrical use manufacturing |
| 335991 |
Carbon specialties for mechanical use (except gaskets) manufacturing |
| 335991 |
Carbons, electric, manufacturing |
| 335991 |
Carbons, lighting, manufacturing |