Spark plug with a surface discharge section

Spark plug with a wide discharge gap

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

Spark plug with an improved seal

Spark plug with annular rings in insulating core channels formin

Spark plug with automatically adjustable gap

Spark plug with built-in pressure sensor

Spark plug with built-in resistor

Spark plug with center electrode and surrounding ground...

Spark plug with center electrode having high heat...

Spark plug with center electrode having variable diameter portio

Spark plug with central electrode attachment member containing p

Spark plug with combined surface and air spark paths

Spark plug with copper cored ground electrode and a process of w

Spark plug with counterelectrode having plural apertures in flat

Spark plug with creepage spark gap

Spark plug with easy-to-recognize identification marks

Spark plug with easy-to-recognize identification marks

Spark plug with electrode including precious metal

Spark plug with electrodes having noble metal inserts