Spark plug having a multi-tiered center wire assembly

Spark plug having a noble metal electrode portion

Spark plug having a noble metal electrode tip

Spark plug having a noble metal firing tip bonded to a front end

Spark plug having a noble metallic firing tip bonded to an...

Spark plug having a noble-metal chip and method for...

Spark plug having a particular resistor

Spark plug having a platinum tip on an outer electrode

Spark plug having a plurality of center electrodes

Spark plug having a plurality of vertical ground electrodes and

Spark plug having a protective titanium thereon, and methods...

Spark plug having a reduced lead glaze layer on the...

Spark plug having a spark discharge portion with a specific comp

Spark plug having a specific structure of noble metal tip on...

Spark plug having a sub-combustion chamber for use in fuel ignit

Spark plug having a welded electrode and the method of...

Spark plug having an ablative coating for anticontaminat fouling

Spark plug having an erosion resistant tip

Spark plug having an internal conductor configuration

Spark plug having an oil film on an intermediate portion of...