US Patent 7170755 Electronics card with an alignment opening

An electronics card, such as a backplane, is precisely aligned with a structure, such as a card cage, via alignment tabs by forming the electronics card to have alignment openings that extend through the electronics card and snuggly accept the tabs. The alignment opening has a width, while the tabs have a thickness that is greater than zero and less than the width. Further, the alignment openings have lengths that are the same size as the lengths of the alignment tabs.