Thursday, December 15, 2011

ELECTRO - MECHANICAL CALCULATING DEVICE


Mark - I :- It was invented in 1943 A.D. by Howard Aiken.
ABC       :- It was invented in 1942 A.D. by Dr. John Atnasoff.
ENIAC  :- It was invented in 1946 Dr. John W.. Mauchly & 
                      J. Presper Eckert.
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