Dual-action shoe arch

作者: Karl J Patry

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摘要: This invention refers to footwear and more particularly the conventional types of shoes or boots. It is an object this provide a new improved type shoe that will avoid one disadvantages limitations prior art. Another present...

参考文章(4)
William C Burns, Metatarsal half sole ,(1929)
Columbus Walter Glenn, Instep-plate for shoes. United States. Patent Office.. ,(1912)
Stagl Joseph E, Rubber cushion arch protector ,(1931)