| 摘要 |
An angular viewing device is taught which enables the viewer to see, while looking downward, objects and scenery in front of him, to the right and left and also above and below the horizontal plane of the viewer's eyes. The viewing device and all of its reflective surfaces or mirrors are housed in a casing which is waterproof and also highly aerodynamically wind-resistant. The device is primarily for use as an optical visual aid for mounting on the handle bars of bicycles for forward vision purposes, safety, and easing of muscle strain associated with riding certain types of bicycles, such as English racer types.
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