Question

who invented altimeter and when?? please tell in Hindi

Answer 1

In 1928, German inventor Paul Kollsman changed the world of aviation with the invention of the world's first accurate Barometric Altimeter also called the “Kollsman Window”. 

Answer 2

heyaa dear...here is your answer.. - The Inventors In 1928, German inventor Paul Kollsman changed the world of aviation with the invention of the world's first accurate Barometric Altimeter also called the “Kollsman Window”. Lloyd Espenschied invented the first radio altimeter in 1924. In 1938, the fm radio altimeter was first demonstrated in New York by Bell Labs.
. sorry for it is in English.... don't mind just read it and translate into hindi...