Assertion: power station's unit | /r/HasAspect | concave indent
Facets:
value: on the top
type: LOCATION
Source sentences:
text: In addition, the unit has a concave indent on the top so that, if you have more than one Delta 1300, you can stack them; even if you don’t, it’s a handy surface to set your phone or other small objects on without worrying about their sliding off.