Prototypes go Results Found: 4 Button group with nested dropdown CAST Corporation AMFA CAST Corporation 11364 Hwy 37 Hibbing MN 55746 (218) 263-8510 Northern Engineering AMFA Northern Engineering 100 Ogden Ave Superior WI 54880 (715) 394-4211 NRRI - Natural Resources Research Ins... AMFA NRRI - Natural Resources Research Inst. 5013 Miller Trunk Hwy Duluth MN 55811 (218) 788-2694 Northland Machine, Inc. AMFA Northland Machine, Inc. 35234 US. Hwy. 2 Grand Rapids MN 55744 (218) 328-6479