After graduation, he worked for a short time on circuit design at the Electrotechnical Laboratory—a preeminent research laboratory sponsored by the Ministry of Telecommunications.
Sasaki was assigned to an aircraft maker called Kawanishi, which was based in the western Japanese port of Kobe.
[6] He later worked in Kobe Kogyo, the first Japanese company to manufacture transistors, and then in Hayakawa Electrical Industries, where he helped to develop electronic calculators.
[7] This eventually led him to obtain American patent licences to fabricate integrated chips and thus the first commercially successful pocket calculator.
His frequent trips overseas to study the latest developments in semiconductor technologies earned him the popular nicknames "Rocket Sasaki" and "Mr.