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Mechanical Calculator Brunsviga model 13Z

1945-1955

Electronic Calculator

1973

Key-Set Mechanical Calculator

1965-1975

Mechanical Calculator

1950

Key-Driven Calculator

1940-1960

Mechanical Calculator

1925-1935

Mechanical calculator

1890-1910

Model 370 programmable calculator by Wang Labs Inc, accompanied by two model 371 card readers, one model 326E data storage package and a model 301 printer, and other accessories.

Wang Labs calculator and accessories

circa 1973