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Self-tutorial learning aid has injection molded plastic tray holding ring binder with question and answer sheets
Self-tutorial learning aid has injection molded plastic tray holding ring binder with question and answer sheets
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机译:自学式学习辅助工具具有注塑塑料托盘固定环活页夹和问答纸
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摘要
A study aid (1) consists of a tray holding a ring binder (4) holding a number of pages with questions and answers underlain in different colours. The tray front edge has a series of cells whose upper surfaces are colour coded chips.
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