| http://www.w3.org/ns/prov#value | - A device of the character described, consisting of substantially flat sheet material provided with hinges on which two of its ends may be turned up, one of the said ends having a transverse slot and a'portion on the other end adapted to pass through said slot and thereby connect the two ends, and be held against movement toward the hinge on which said slotted end is turned up, said end portions an
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