Multifunctional scaffolding and pushcart convertible utility device
作者： W. Travis Lontz , Grant L. Bittle , David C. Calvert , Christopher R. Webb , Michael K. Thompson
DOI:
关键词:
摘要: A multi-functional utility apparatus that is convertible between a scaffold configuration and pushcart configuration. pivotal coupling assembly first second subframes allows the to be expanded for use as scaffolding or collapsed pushcart.
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