1.LED
holonyak studied in PhD Electrical Engineering University of Illinois on October 1954. Holonyak friends actually had to admit holonyak discovery's was great and worth the findings and decent given the Nobel Prize,but Holonyak not want to ,he said "...It's ridiculous to think that someone owes something, we are lucky to be alive,when comes down to it. Nick Holonyak invented useful first practical LED in 1962
2.Tetris
Alexei Pajintov a Russian computer programmer without obtaining any money from his invention by his employer, the government soviet. Alexei Pajintov said "you can always make a little more,"he said,"but I never seriously thought about t. I am alive I am alive". Though Tetris has penetrated into world and game was well-known in every gaming platform in eighties.
3.speakerphone
during his life time an american inventor Walter L Saw could not of his invention is very useful in telecommunications world.Because some patents some expire before they commercialize the product, Shaw entrepreneurs suffer losses and makes Walter L Shaw frustrating so in 1976. he created 'interception proof; box to call the mafia, because his actions he was invited of illegal phone use.
4. AK-47
name accordance with inventor name's Kalashinkov or AK-47.Mikhail Kalshinkov a soviet soldier found when he was recovering in hospital because he suffered due to World War 2
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