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World encyclopedia display has inner and outer display discs connected by pivot pin and with windows for display of geographical information
World encyclopedia display has inner and outer display discs connected by pivot pin and with windows for display of geographical information
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机译：世界百科全书显示器的内部和外部显示盘通过枢轴销连接，并带有用于显示地理信息的窗口
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摘要
The world encyclopedia display has at least two concentric discs, the larger (1a) connected to the smaller diameter disc (2a) for rotation. The smaller disc has a series of windows around its edge to allow viewing of indicia on the front face of the larger disc. The discs are positioned in a clear plastic envelope with a pivot axis (6) around which the larger disc rotates.
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