Establishments primarily engaged in manufacturing porcelain electronic and other electrical insulators, molded porcelain parts for electrical devices, spark plug and steatitic porcelain, and electronic and electrical supplies from clay and other ceramic materials.
- Alumina porcelain insulators
- Beryllia porcelain insulators
- Cleats, porcelain
- Ferrite
- Insulators, porcelain
- Knobs, porcelain
- Magnets, permanent: ceramic or ferrite
- Porcelain parts, molded: for electrical and electronic devices
- Spark plugs, porcelain
- Titania porcelain insulators
- Tubes, porcelain