In the 1700s,who would pay the postage fee for letters before the stamp was invented?
Later in 1840, Rowland Hill invented the stamp, which was paid for by the sender, not the receiver.
Which object, initially called the 'Whirlwind', was invented by Ives McGaffey in 1869?
What charge card, developed in 1950, was the first to be approved nationally in the US?
The card was established by Frank McNamara and Ralph Schneider.
We remember Charles Babbage (1792-1871)for what ........
In which year was the first solid state integrated circuit demonstrated?
Who invented Electrocardiograph(EKG)?
The EKG was invented by Willem Einthoven in 1903 and is used to monitor and analyze past and present heart activity in an individual.