- Electromagnet➖ William Sturgeon (England)
- Steam Engine➖ James Watt (Scotland)
- Radio➖ G. Marconi (Italy)
- Microscope➖ Z. Janssen (Netherlands)
- Logarithm➖ John Napier (Scotland)
- Electric Lamp➖ Thomas Alva Edison (USA)
- Telephone➖ Alexander Graham Bell (USA)
- Elevator (lift)➖ Elisha G. Otis (USA)
- Talking Film➖ Warner Bros (USA)
- Gramophone➖ Thomas Alva Edison (USA)
- Fountain Pen➖ Lewis E. Waterman (USA)
- Radar➖ Dr A. H. Taylor and L. C. Young (USA)
- Revolver➖ Samuel Colt (USA)
- Submarine➖ D. Bushnell (USA)
- Telegraph➖ Samuel B. Morse (USA)
- Radioactivity➖ Antoine-Henri Becquerel (France)
- Motor Car (Petrol)➖ Karl Benz (Germany)
- Motor Cycle➖ Edward Butler (Britain)
- Television➖ John Logie Baird (Britain)
- Electromagnetic Induction➖ Michael Faraday (Britain)
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