| Symbol | Typ | Titel |
|---|---|---|
| C | SK | CHEMISTRY; METALLURGY |
| C03 | KL | GLASS; MINERAL OR SLAG WOOL |
| C03B | UKL | MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES |
| C03C | UKL | CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS |