age ~78
from Grand Rapids, MI
Dr. Harry Knopke tells us the story of Aqua Clara International, a non...
Aqua Clara is a remarkable company, founded by Bob MacDonald, a retire...
Friday, November 9 - If you have preschool-aged kids, then you're prob...
An interview with Dr. Harry Knopke for the documentary "MACHINE." reve...
I'm Vicki Knopke and I'm working on a PhD in Technology and Gender and...
My intro :D :D.
A brief interview with Dave Knopke as he tells about his experience wi...
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