Assertion: spark plug's shell | /r/HasProperty | threaded
Facets:
value: metal
type: DEGREE
Source sentences:
text: A spark plug has a metal threaded shell, electrically isolated from a central electrode by a porcelain insulator.
text: Spark plugs consist of a metal threaded shell, a porcelain insulator, and a central electrode, which may contain a resistor.
text: A spark plug has a metal threaded shell, electrically isolated from a central electrode by a porcelain insulator.