Spark plug of an internal combustion engine

Spark plug of an internal combustion engine

Spark plug of internal combustion engine having glaze layers...

Spark plug power enhancer

Spark plug requiring low discharge voltage and having high...

Spark plug resistant to accidental discharges

Spark plug seal

Spark plug shell having a bimetallic ground electrode spark...

Spark plug structure

Spark plug structure for improved ignitability

Spark plug system

Spark plug used for cogeneration purpose and adjusting...

Spark plug with 360 degree firing tip

Spark plug with a corrosion impeding layer

Spark plug with a ground electrode concentrically disposed to a

Spark plug with a ground electrode concentrically disposed to a

Spark plug with a looped ground electrode concentrically dispose

Spark plug with a plurality of ground electrodes

Spark plug with a sphere-like metal center electrode and manufac

Spark plug with a stepped insulator and an inner constriction in