Wallach, Circuit Judge.
Allied Erecting and Dismantling Co., Inc. ("Allied") appeals the United States Patent Trial and Appeal Board's ("PTAB") decision, on inter partes reexamination, concluding that claims 1-21 of U.S. Patent No. 7,121,489 ("the '489 patent") would have been obvious over German prior art reference DE 297 15 490 U1 ("Caterpillar...
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