- Cleats, porcelain (3)
- Ferrite and ferrite parts (17)
- Insulators, electrical: porcelain (26)
- Knobs, porcelain (9)
- Magnets, permanent: ceramic or ferrite (87)
- Porcelain parts for electrical devices, molded (9)
- Spark plugs, porcelain (3)
- Tubes, porcelain (4)