| http://www.w3.org/ns/prov#value | - Referring again to FIG. 2, the bolt holes of varying shapes, such as those seen at 70a, 70b, 70c and 70d, allow the frames to be attached to the wall pans with bolts and nuts in a sloping or level manner, thereby insuring a required slope or neutral trench when the form is removed from concrete or other materials.
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