In 1912, Jay R. Monroe invented the commercial calculator and opened
a factory in New Jersey for manufacturing and distribution. Named after
the inventor and founder, Monroe was a huge success! Monroe soon 
became a household name with accounting and financial service
professionals around the world. The company is headquartered in 
Bristol, PA.

Jay Randolph Monroe

 William Seward Burroughs I
(January 28, 1855 – September 15, 1898)

Burroughs was an inventor born in Rochester, New York 
who invented a "calculating machine" designed to ease
the monotony of clerical work. He was a founder of the
American Arithmometer Company (1886), which later
became the Burroughs Adding Machine Company
(1904), then the Burroughs Corporation (1953)
and in 1986, merged with Sperry Corporation to
form Unisys.

Sir Isaac Newton was born on January 4, 1643 in Woolsthorpe, England
and died in London on March 31, 1727.

Physicist and mathematician Sir Isaac Newton became one of the most
influential scientist of all time for formulating the three basic laws of motion
and the law of universal gravitation. He built the first practical reflecting
telescope and his work helped Enlightenment thinkers rebel against
Church theology. Newton’s mother wanted him to be a farmer, but the
headmaster of King’s School, Henry Stokes, convinced her to let him
complete his education. 
 

The Baby Calculator was first manufactured in Chicago in 1929 and this one
dates from about 1940.