When was the first accurate clock designed?
When were shadow clocks first used?
When were mechanical clocks made?
What kind of clocks were used in ancient Egypt?
When were sand glasses used?
Where were the first wristwatches made?
When was the telephone invented?
Where was Alexander Bell born?
What kind of job was Alexander Bell given when he got to America?
Who was his work financed by?
What were the first words spoken over the telephone?
When was the first communication satellite launched?
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