Each of the foregoing advantages of this invention are achieved with a relatively simple structure which may be manufactured and installed at a minimum cost.

每个上述优点，本发明是实现一个相对简单的结构可能是制造和安装在最低的成本。

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Each of the foregoing advantages of this invention are achieved with a relatively simple structure which may be manufactured and installed at a minimum cost.

每个上述优点，本发明是实现一个相对简单的结构可能是制造和安装在最低的成本。

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