Assertion: pencil sharpener | /r/CapableOf | employ twin planetary cylinders
Facets:
value: with spiral cutting edges
type: OTHER
Source sentences:
text: In the US, the period of innovation virtually ended in the mid-1910s, when pencil sharpeners employing twin planetary cylinders with spiral cutting edges (image to right) drove from the market machines with numerous alternative sharpening technologies that had co-existed for as long as twenty-five years.