HP 22


Business Calculator

"Introduced on August 1 1975, six months after the HP-21, this was the eighth equal (with the HP-25) handheld electronic calculator sold by HP - the business counterpart of the HP-21, and the same size... Its codename of "Turnip" carried on the tradition of calling these models after vegetables." Wlodek Mier-Jedrzejowicz.
Source: MoHPC - The Museum of HP Calculators

X-Number World