Curta Calculator breakdown
Curta calculator (my parents use one)
vintage calculator / retro mechanical calculator / by BOULOTDODO
How cool. Love it. CURTA, Calculator, Mechanical
A Vintage Mechanical Calculator Spins Wildly While Trying to Divide by Zero
Old computer / mechanical calculator BK-1 - http://electronics.goshoppins.com/vintage-computing/old-computer-mechanical-calculator-bk-1/
Pascal's Calculator (1670). A mechanical calculator that could add and subtract, built by the philosopher Blaise Pascal in the 1670s. The system of cranks and gears is comparable in complexity to the Antikythera mechanism from 1000 years earlier.
Rokli Mechanical Calculator Front/Right
Vintage Magic Brain Mechanical Pocket Calculator, Made in Japan.