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RE: NATURE INSPIRED INVENTIONS --- Sonar System; and I measured the depth of the sea. It was on my Mark Twain!
Smiles.. @star-vc, thank you so much for your kind words, they just made my day. 😁
Smiles.. @star-vc, thank you so much for your kind words, they just made my day. 😁
You are most welcome!! :)