Assertion: seesaw | /r/HasProperty | elongated seat-carrying means
Facets:
Source sentences:
text: A seesaw comprising a support, elongated seat-carrying means, resilient means interconnecting said support and one end of said firstnamed means, and means interconnecting said support and an intermediate portion of said firstnamed means permitting axial movement of said first-named means and also rocking movement thereof about two horizontal axes normal to each other.