Assertion: manhole cover's opening | /r/HasProperty | inflated
Facets:
Source sentences:
text: having a device for expanding the diameter thereof, is placed within the space within the manhole frame 2 and the opening of the sewer catch basin 4, The expandable means, or inner tube 14, is then inflated to cause it to engage the interior edge of both the manhole frame 2 and the sewer catch basin 4, as shown in FIG.