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专利名称：Ladder发明人：Charles L. Adas申请号：US05/547572申请日：19750206公开号：US03944024A公开日：19760316
摘要：A ladder is made from extruded aluminum steps supported on a pair of verticaltubes fitted through large diameter holes drilled vertically through the steps. The stepsare hollow except for a pair of vertical walls extending longitudinally thereof and lying onopposite sides of the vertical holes. Small horizontal holes are drilled through thesewalls from the rear of the steps to receive fastening pins which are driven through thetubes to locate and support the steps on the tubes.
申请人：DETROIT MARINE ENGINEERING
代理机构：Harness, Dickey & Pierce
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