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Science Museum on Twitter: "This foot-operated vacuum cleaner (1905) was human powered as few houses at the time had electricity. The glass chamber allowed people to see the dirt being sucked in
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1920 Vintage Hoover Vacuum cleaner Ad (Image1) | Vintage advertising art, Hoover vacuum cleaner, Vintage advertisements
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Rethinking Business Models in the Great Depression: The Failure of America's Vacuum Cleaner Industry | Business History Review | Cambridge Core
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