Inventors:
David W. Hendrickson - Hibbing MN, US
Iwao Iwasaki - Grand Rapids MN, US
David J. Englund - Bovey MN, US
Thomas R. Larson - Montgomery TX, US
Blair R. Benner - Grand Rapids MN, US
Donald R. Fosnacht - Hermantown MN, US
John Engesser - Grand Rapids MN, US