| http://www.w3.org/ns/prov#value | - For a signal storage apparatus employing a stack of coaxial common axially supported circular record disks for being commonly rotated and accessed by deflecting a segment portion of selected ones of said disks,the improvement including in combination: a stack of axially spaced-apart storage disks having a minimal axial spacing at the axial center of the stack and a maximum axial spacing between di
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