Spark plug having noble metal tip

Spark plug having resistance against smoldering, long...

Spark plug having ring shaped auxiliary electrode with thickened

Spark plug having specific configuration of center electrode...

Spark plug having specified spark gap dimensional relationships

Spark plug having tapered ground electrode

Spark plug having titanium diboride electrodes

Spark plug having Y-shaped or V-shaped electrodes

Spark plug in use for an internal combustion engine

Spark plug in use for an internal combustion engine

Spark plug including a ground electrode, a center electrode, and

Spark plug including electrode with protruding portion for holdi

Spark plug internal combustion engine

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

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

Spark plug system

Spark plug used for cogeneration purpose and adjusting...

Spark plug with a corrosion impeding layer

Spark plug with a looped ground electrode concentrically dispose

Spark plug with an electrode having a platinum-nickel fiber comp