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Period: to
Inventions
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vacuum cleaner
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air conditioning; automated tea maker
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electrocardiogram; first powered flight
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radar; tea bags; diodes
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plastic; windscreen wipers; silencer for guns
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radio broadcasting
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electric washing machine
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coffee filter; water coolers; paper cups; assembly line production
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neon lamps
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stenotype machines
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Ecstasy; Brillo pads; crossword puzzles; bras; zips
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sonar
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hair dryers; kiss-proof lipstick; submachine guns
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robots; insulin
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Aga cooker
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hearing aids
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frozen food
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Geiger counter; television
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liquid fuel rocket; pop-up toaster; aerosol sprays
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‘Talkies’ at the movies
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iron lung; penicillin
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artificial life
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jet engine; mechanical toothbrushes; Scotch tape