| 摘要 |
PROBLEM TO BE SOLVED: To provide a height scale in which records and photographs at differ ent times can be freely displayed in desired display positions. SOLUTION: Two opposed surfaces are made parallel to each other; millimeter unit scales are provided on the opposed surfaces and surfaces, having heights in millimeters, of some objects have the heights in millimeters, so as to enable the records to be made and the photographs can be displayed; and the some objects are stacked in such a manner as to be made higher in millimeters by using an auxiliary tool with the millimeter unit scale so as to be prevented from collapsing.
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