A foundation pile with enhanced pull-out strength.
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The height adjustment component to two molds installed when slushing concrete.
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A collapsible bicycle, while it is movable in the state where it folded up.
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A fixing structure of a partial denture or full denture which is capable of surely and stably fixing the denture by using an obscure and transparent plastic material without using unsightly metal
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The rotation windmill which rotates in the fixed direction.
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