Assertion: mast | /r/HasProperty | built
Facets:
Source sentences:
text: When the mast was built the call letters of the television station for which it was built were changed to KTHI, the "HI" referring to the height of the mast.
text: Masts over 300 meters (980 ft) are prohibitively expensive and very few have been built; the tallest masts in the world are around 600 meters (2,000 ft).