Tokyo Shibaura Electric Co., Ltd.
In 1939, two companies, leaders in their respective fields, merged to form an integrated electric equipment manufacturer, Tokyo Shibaura Denki (Tokyo Shibaura Electric Co., Ltd.). The company was soon well known as 'Toshiba', which became its official name in 1978.
Toshiba plays an important role in the history of Texas Instrument‘s calculators. The only official reported calculator manufactured by Toshiba and sold under the TI brand is the TI-66. Anyway, if you dig deeper into some other calculators like the TI-1106, TI-1750 or TI-1790 you’ll notice more than the influence of Toshiba’s calculator chips. Toshiba TEC Corporation is the proofen manufacturer of most desktop calculators introduced by Texas Instruments between 1981 and 1988. Today most calculators developed and manufactured by Texas Instruments and their OEM partners use a "brain" with the Toshiba logo.
Eventually Toshiba exit the calculator business in 1983.
Source : Joerg Woerner, Datamath Calculator Museum