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Blaise Pascal and Wilhelm Schickard one of those
The first inventor of the calculating machine was Blaise Pascal.
Leonardo da Vinci. Experts mean the sketch does not really show an adding machine, but a ratio machine.
William Seward Burroughs made his first adding machine prototype in the early 1880s while working in the Boyer Machine Shop. He filed for his first patent for the calculating-machine in January of 1885, and the patent was issued in August of 1888.
Archimedes
Blaise Pascal invented the ancestor of the calculator.
In 1885 William Seward Burroughs constructed his first calculating machine; though it proved commercially impractical. He patented a practical model in 1892.
arithmetic machine
John Napier's calculating machine invention is called "Napier's Bones."
Theodore Simpson built the first automatic calculator called the "Calculating Clock" in 1623. Another machine was built by French Mathematician Blaise Pascal in 1642. However , it was William Seward Burroughs who received the first patent for adding machines in August of 1888.
the person who invented it was Hugo Caisaguano
lathe machine hour