Inventec Corp.

Inventec Corporation was founded  in Taiwan, on July 1, 1975 to produce simple calculators and telephone sets. In 1984 Inventec was Taiwan's largest manufacturer of calculators. In the year 1986 an overseas manufacturing base was founded in Penang, Malaysia to take advantage of competitive labour rates.
Inventec Micro-Electronics Corporation (IMC), one of the Inventec Group companies, established a factory in Shanghai, China during 1995. Inventec manufactures most of  Texas Instrument’s graphing calculators from the TI-73 to the TI-89 and the data collection systems CBL2 and CBR. IMC was renamed IME after Inventec group's reorganization in 1999. 

Source : Joerg Woerner, Datamath Calculator Museum