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Silver has been used in coinage ever since coinage was made. The earliest coins were made out of an alloy of silver and gold. Silver, along with gold, have been used for coins ever since coinage was made in 700 BC or so.
That's HAVE PENNIES, not "has penny's". If you're referring to U.S. pennies (really cents), they've been made since 1793. If you're referring to the British coin that is really named a penny, they've been minted since the 8th century.
The abacus has been around for millennia, in various countries. No record of the inventor was made.
Inventor
Iit is as long as it is because it was made to be exactly 25.4mm in length by the international measurements council in 1959.