A storage buffer system for an automated material handling system (AMHS) includes a retractable buffer device disposed in proximity to a processing tool, the retractable buffer device having an extended position disposed directly below an overhead transport (OHT) vehicle path. The retractable buffer device further includes a retracted position that is removed from a process aisle space. In the extended position, the retractable buffer device is configured to facilitate loading and unloading of product therein without the use of lateral motion capability of an OHT vehicle.
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