Assertion: box spring's foundation | /r/HasProperty | boxspring
Facets:
value: often
type: TEMPORAL
Source sentences:
text: When using a regular bed frame you'd have to pair the mattress with a foundation (boxspring).
text: A foundation (box spring) is a bed base with a wooden frame and either springs or metal rods that provide support to a mattress.
text: Make sure you know which kinds of foundations (often a box spring) will void your warranty.