| http://www.w3.org/ns/prov#value | - A protective cartridge for data information disks comprising front and rear walls that define a compartment for enclosing a data information disk, a sliding door movable from a closed position for covering said disk to an open position for exposing said disk during a read operation, said door including at least one shutter having a flat planar portion overlapping one of said walls, a slider upon w
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