There Are Two Critical Points

First Words On The First Telephone - "mr. Watson - Come Here - I Want To See You."

Watson, ... If I Can Get A Mechanism Which Will Make A Current Of Electricity Vary In Its Intensity, As The Air Varies In Density When A Sound Is Passing Through It, I Can Telegraph Any Sound, Even The Sound Of Speech.

When One Door Closes, Another One Opens.

One Day Every Major City In America Will Have A Telephone.

Observe, Remember, Compare.