Blaise Pascal

 

623-1662. Pascal constructed his "Pascaline" in Paris. This 5-digit machine used a different carry mechanism from Schickard's, with rising and falling weights instead of a direct gear drive; it could be extended better to support more digits, but it could not subtract, and probably was less reliable than Schickard's simpler method. Where Schickard's machine was forgotten - Pascalwas apparently unaware it ever existed - Pascal's became well known and established the computing machine concept in the intellectual community.  

He made more machines and sold about 10-15 of them, some supporting as many as 8 digits. Patents being a construct of the future, others also sold copies of Pascal's machine.