| http://www.w3.org/ns/prov#value | - inks by said third and fourth pivot connections, and said second end of said linkage is pivotally connected to said mounting member solely by said second pivot connection; and a locking means for releasably retaining said support in positions intermediate said lower and upper positions, said locking means including a first locking surface defined by said linkage and a second downwardly facing lock
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