Spark plug for internal combustion engines having an alloy layer

Spark plug for internal-combustion engine

Spark plug for internal-combustion engine

Spark plug for internal-combustion engine and manufacture method

Spark plug for internal-combustion engines

Spark plug for motor vehicle internal combustion engine

Spark plug for use in an internal combustion engine

Spark plug for use in an internal combustion engine

Spark plug for use in an internal-combustion engine with a...

Spark plug for use in internal combustion engine

Spark plug for use in internal combustion engine

Spark plug for use in internal combustion engine

Spark plug having a built-in resistor for suppressing noise sign

Spark plug having a bypass electrode extending along a...

Spark plug having a creepage spark gap

Spark plug having a flame deflector for use in an internal combu

Spark plug having a metal layer in a terminal metal piece

Spark plug having a metallic shell with defined relationship...

Spark plug having a metallic terminal within a through-hole

Spark plug having a multi-layered electrode