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|1. (WO2018053236) AMASSING PICK AND/OR STORAGE TASK DENSITY FOR INTER-FLOOR TRANSFER|
|Applicants:||AMAZON TECHNOLOGIES, INC.
|Inventors:||DURHAM, Joseph W.
LONGTINE, John Gregory
MILLS, Diane Grieselhuber
WELLMAN, Parris S.
WILSON, Steven Augustine
|Title:||AMASSING PICK AND/OR STORAGE TASK DENSITY FOR INTER-FLOOR TRANSFER|
A transfer rack (1038) on one floor of an inventory system can receive multiple containers (60) each carrying an inventory item retireved from a storage rack (1030) in a storage area, and designated for an operation on a different floor (1050, 1052) of the inventory system. A vertical lift (1012) can move the transfer rack carrying the multiple containers from the one floor to the different floor. On the different floor, the multiple containers may be swapped for different multiple containers stored in a shuttle rack (1032), each carrying an inventory item designated for an operation on the one floor. The vertical lift may return the transfer rack carrying the different multiple containers to the one floor.