{
  "abstract": "A plurality of material handling vehicles are provided, each including a horizontal drive for driving the vehicle horizontally, a vertical drive for driving the vehicle vertically, and a mechanism for transferring items onto or off the vehicle. Containers of items are extracted from storage locations of a first plurality of storage locations and transferred by corresponding material handling vehicles to bi-directional conveyors that convey the containers toward transfer stations at which items may be removed and transferred.",
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  "title": "Material Handling System Using a Plurality of Vehicles In a Plurality of Modes of Operation",
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