Discussion
Mail-order cataloguing, the flexible urinary catheter, the first pair of bifocals, wooden swim fins, the lightning rod and the glass armonica are the inventions of
Answer: D
They are Benjamin Franklin's.
He also invented the Franklin stove and the lightning rod, and refused to patent any of them, holding that as we enjoy great advantages from the inventions of others we should be glad to serve others by any invention of ours.
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