📣 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)