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Sioux Center, Iowa | I sent you an email. There's a guy from NE Iowa that works for the extension service. Larry Tranel, ISU dairy field specialist. He has designed and even comes out and builds VERY low cost swing parlors. Parabones I think. Heard him speak last winter.
http://connect.extension.iastate.edu/parlor
www.extension.iastate.edu/dubuque/info/Dairy+Publications.htm
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