1.1 to build notch angle pipe semi-automatic. Effective in use.1.2 to build notch angle pipe semi-automatic. Work quickly and safely.1.3 to facilitate the life and harmless to the environment.1.4 to build notch angle pipe semi-automatic, easy to use.1.5 to build notch angle pipe semi-automatic, even work, pipe, education 4 - 6 inches.
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