Keiji Kanao

Spark plug and its manufacturing method

Spark plug for internal combustion engine and method for manufacturing same

Spark plug and ignition apparatus

Structure of spark plug designed to provide higher durability and ignitability of fuel

Spark plug and a method of producing the same

Spark plug for internal combustion engine with Ir alloy molten portion outside spark discharge region

Spark plug for an engine for a cogeneration system

Spark plug for internal combustion engines and manufacturing method thereof

Spark plug for internal combustion engine and manufacturing method thereof

Production method of spark plug designed to provide high temperature oxidation resistance and weld strength and spark plug produced thereby