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US08096071B2 Topple-resistant base mechanism 失效
防顶基机构

Topple-resistant base mechanism
Abstract:
Gust Busters solves the problem of signs being blown over in the wind or being knocked down by the pedestrians or bicycle or the like, by preventing the inward collapsing and outward expansion of the legs of the sign and thus maintaining its ideal position for optimum readability.
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