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The U.S. patent office refuses to assess claims for perpetual motion devices unless the inventors can produce working models.

美国专利局拒绝评估认证永动装置，除非设计者们能制造出可用的模型。

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Their thinking was embodied in a new genre of working models of the economy, called “dynamic stochastic general equilibrium” (DSGE) models.

他们的思想体现在一种经济运作新模式上，称为“动态随机一般均衡（DSGE）”模型。

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Photos of an early version of the modern playground swing have been released in a bid to track down the oldest working models.

BBC: Wicksteed Park releases archive photos for appeal

Brasil reports that the country will receive 50 test laptops from OLPC, making it the first nation to have actual, live, working models.

ENGADGET: OLPC Update: Brazil to get test machines, Thailand pulls out

Two Philadelphia programs, KEYSPOT and Philly Rising, employ this civic collaboration model for planning and implementation and serve as working models for innovative government.

WHITEHOUSE: Community Engagement and Civic Collaboration