Hewlett Packard HP-35 Calculator (1972-1975) Models on Display:Hewlett Packard HP-35 the C cell offered a

the C cell offered a compact

Gilbert Company

the world's first transistor radio

While its development partner Philips favored a top-loading design

6 million copies

Hewlett Packard HP-35 Calculator (1972-1975) Models on Display:Hewlett Packard HP-35 the C cell offered aHewlett Packard HP 35 First Handheld Scientific Calculator The Hewlett Packard HP 35, launched in February 1972 for $395 (roughly $3,000 today), was the legendary "slide rule killer" that fundamentally changed science and engineering. As the world's first handheld scientific calculator, it was famously designed to meet a personal challenge from company co founder Bill Hewlett: shrinking a 40 pound desktop computer into a device that could fit inside