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专利名称：Assemblies comprising foot rungs, for
example for ladders
发明人：GUBRI; LEON申请号：US374473申请日：19730713公开号：US3880257A公开日：19750429
摘要：The rungs are of polygonal shape and are introduced, on assembly, intoopenings of corresponding shape, provided in the uprights of the ladder. Fixing is theneffected by beading over. The rungs have a crenalated shape and their thickness isslightly increasing towards the edges of the polygonal section. The devices are useful forany ladders for building, household work, etc.
申请人：GUBRI; LEON
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