First mobile phone 📱 was invented by Martin Cooper on 3rd April 1973. He was a researcher in Motorola.
When was first com mercial mobile phone made and by whom?
Martin Cooper
The interrogative pronouns are: who, whom, what, which, whose.Example sentences:Who says your mobile phone is lighter than this laptop?For whom is your mobile phone lighter than this laptop?What tells you that your mobile phone is lighter than this laptop?Which of your mobile phones is lighter than this laptop?Your mobile phone is lighter than whose laptop?
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Dr. Heinrich Hertz
abraham kamen
by whom binary is invented
The first digital computer was invented in 1943 by John Atanasoff and Clifford Berry.
by whom octal is invented
by Hugh Janus in 1988
By Alexander Parkes in the 1850's and it was first called Parkesine
The first safety razor was invented in 1762. The person who invented it was a Frenchman named Jean-Jacques Perret. In 1875, the Kampfe Brothers came out with a new design.