| http://www.w3.org/ns/prov#value | - In FIG. 9, I illustrate that principles of the invention are not only applicable to a two-dimensional single plane retrieval surface matrix of the character thus far described, but also to a matrix in which the surface may have curvature, as for example the inner surface of an annular shell in which one dimension of scan is vertical, and the other dimension angular, about the axis of the storage m
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