PURPOSE: a kind of structure is formed as bamboo shape and is provided to only to produce buckling phenomenon, while preventing body from destroying, and is formed inside multiple adapter bodies when external force is applied to main body. ;CONSTITUTION: it includes multiple coupling parts (111) at predetermined intervals in main body hollow shape that structure (100), which is formed as bamboo shape,. Main body and coupling part form a main body. The main body is by polymer material hollow shape. It connects main body and body interior is formed and blocked. ;The 2010 of copyright KIPO submissions
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