The US Patent Office Issues a Patent for the Spalding Adding Machine On January 13, 1874 The US Patent Office issues a patent for the Spalding Adding Machine. The precursor of calculators and computers, mechanical adding machines could do simple…

The US Patent Office Issues a Patent for the Spalding Adding Machine On January 13, 1874 The US Patent Office issues a patent for the Spalding Adding Machine. The precursor of calculators and computers, mechanical adding machines could do simple…