Assertion: razor's blade | /r/CapableOf | enable second blade
Facets:
Source sentences:
text: The development of Gillette's first twin-blade razor began in early 1964 in the company's Reading laboratories in England when a new employee Norman C. Welsh experimented with tandem blades and discovered what he called the "hysteresis effect"; a blade pulling the whisker out of the hair follicle before cutting it, and enabling a second blade cut the whisker even shorter before it retracted back into the follicle.