| 摘要 |
Expansible box consisting of two hollow bodies 4 and 5, one penetrating inside the other, the internal body 5 being provided with a closed bottom 6.
<??>A strip of thin harmonic steel sheet is interposed between these two bodies; this thin sheet carries inclined slots 8 in which are engaged fingers which are integral with the casing of the internal hollow body 5.
<??>The steel strip can slide freely when actuated by a manual lever.
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