| http://www.w3.org/ns/prov#value | - Another embodiment of the present invention is a method of holding open a surgical cavity comprising the steps of surgically providing an incision with a longitudinal axis with the incision having opposite extremes, inserting a first pair of blades into the incision, spreading the blades apart along an axis to opposite extremes, locking the blades in place at opposite extremes, inserting a third b
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