A filtration system for collecting bone fragments during surgery performed on a patient includes a cylinder having a rotating disk with circumferential arms extending radially in the cylinder to define pockets. One or more clamps are mounted on a fixture for temporarily securing the fixture to the article. The access switches are arranged in switch peer groups and store information about other access switches in that switch peer group and about locations of wireless client devices that are associated with any access switch in the switch peer group. The print carrier element and the protective film element are disposed in mirror image relative to a fold axis formed in the carrier sheet.