Ring Display with Retractors
作者： Mark H. Goldberg
DOI:
关键词: Simulation 、 Spring (mathematics) 、 Aperture (computer memory) 、 Ring (chemistry) 、 Optics 、 Retractor 、 Materials science
摘要: A display for displaying a plurality of rings with having number pockets in each which ring can be nested. Each pocket has an aperture the bottom tether extending through attachment to other end being attached retractor secured display. The permits person examine but not remove it from is preferably spring loaded reel. ramp on side placed diagonally across stop turning into alignment as pulls pocket.
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