In 1947, US telephone companies began using what?

More Questions:

In what game do countries play for the Venice Cup?

When was the Red Bull energy drink first introduced?

What literary work inspired Jefferson Airplane's "White Rabbit" song?

Bubble wrap was invented accidentally by researchers who were trying to develop a new type of what?

The kingfish is actually the largest species of what type of fish?

What part of the human body experiences different growth rates called anagen, catagen, and telogen?

Who was the first American scientist to win a Nobel prize?

What actor is known as "The Fonz"?

Who won an Academy Award in 1970 for directing the film "Midnight Cowboy"?

What TV show closes with a logo for "30th Century Fox"?

In the world of music how is "Harry Lillis" more commonly known?

In what movies is the Okinawan sword-maker Hattori Hanzo a character?

What song earned Natalie Cole and Nat King Cole a Grammy Award in 1991?

What structure did the Chrysler Building surpass in 1929 as the tallest building in the world?

Which character, that first appeared in the book "Winnie-the-Pooh", loves watercress?