📣 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)