Abstract
News editors obtained the following quote from the background information suppli ed by the inventors: “Online retail businesses selling multiple product lines, s uch as online grocers and supermarkets, require systems that are able to store t ens or even hundreds of thousands of different product lines. The use of single- product stacks in such cases can be impractical, since a very large floor area w ould be required to accommodate all of the stacks required. Furthermore, it can be desirable only to store small quantities of some items, such as perishables o r infrequently-ordered goods, making single-product stacks an inefficient soluti on.
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