Assertion: spark plug's heat range | /r/CapableOf | cope with their demands
Facets:
Source sentences:
text: In the late 1970s, the development of engines reached a stage where the heat range of conventional spark plugs with solid nickel alloy centre electrodes was unable to cope with their demands.
text: In the late seventies, the development of engines reached a stage where the ‘heat range’ of conventional spark plugs with solid nickel alloy center electrodes was unable to cope with their demands.