With electronic typerwriters, journalism underwent a sea - change in the 1940s. what does this line mean?is it means that electronic typewriters were invented in 1940s?

With electronic typerwriters, journalism underwent a sea - change in t

1.	With electronic typerwriters, journalism underwent a sea - change in the 1940s. what does this line mean?is it means that electronic typewriters were invented in 1940s?
Answer» tion:I THINK that the SEA is very vast in shape so sea-chang phrase is used becuse after the coming of the typewriters there was a GREAT revolutin or a great change OCCURED in the field of journalism.Please mark as BRANLIEST