192
Opinion of the Court
We further realize that, contrary to our assumption in Part II-A, supra (where we discussed a legal issue in respect to which knowledge was irrelevant), the Klehrs did claim that they lacked knowledge of the faulty silo—the "source" of their injury. But that particular "lack of knowledge" claim does not require us to consider the various "discovery rule" differences among the Circuits, because the Klehrs failed the "knowledge" test that favors them the most—the Eighth Circuit's "injury plus source plus pattern" rule. That rule would have found the Klehrs' action timely had it not been the case that the Klehrs reasonably "should have discovered" all of those elements prior to 1989. 87 F. 3d, at 239. If the Klehrs cannot fit their case through the Eighth Circuit's larger hole, they cannot squeeze it through a smaller one.
In addition, the major difference among the Circuits— whether a discovery rule includes knowledge about a "pattern"—is clearly not at issue here. Harvestore marketed and sold its "oxygen-limiting" silos for many years before the Klehrs purchased theirs, and the Klehrs have not claimed lack of knowledge of a "pattern." Nor has anyone argued any other legal differences among the Circuits' various tests that would affect the outcome in this case.
In these circumstances, we believe we should not consider differences among the various discovery accrual rules used by the Circuits. The legal questions involved may be subtle and difficult. Compare id., at 238 (claim accrues with discovery of existence and source of injury, plus pattern), with Bivens Gardens, supra, at 1554 (claim accrues with discovery of injury and pattern); see also Cada, 920 F. 2d, at 451 (describing differences among various discovery rules and doctrines of "equitable tolling" and "equitable estoppel"). And the facts of this case do not force focused argument as to how the traditional Clayton Act "injury" accrual rule, principles of equitable tolling, and doctrines of equitable estoppel should interact in circumstances where the application of one, or another, of these different limitations doctrines would
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