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Tokyo Electron Limited (TEL) is the one of the world's largest manufacturers of semiconductor production equipment. TEL's chip-making systems include chemical vapor deposition, thermal processing, etching, cleaning, and probing equipment. The company also makes flat-panel display (FPD) production equipment, and distributes other companies' chip-making equipment, computer systems, networking products, and software in Japan. Subsidiary Tokyo Electron Device distributes chips, boards, and software made by companies including AMD, Microsoft, and Texas Instruments. Chip production equipment accounts for about three-quarters of TEL's sales, and customers outside Japan account for about 60% of total sales.

Tokyo Ohka Kogyo Co., Ltd. was founded in 1940. Tokyo Ohka Kogyo (TOK) plays an important but small (perhaps even a micro) role. Serving companies in the microprocessing industry, TOK manufactures photoresists (light-sensitive resins that can imprint patterns onto silicon wafers) used during the production of semiconductors, printed circuit boards, and flat panel plasma and liquid crystal displays (LCD). The company operates through several subsidiaries located in Japan, the US, Europe, and Asia. In addition to its photoresist operations, which make up about half of its overall sales, TOK also operates a chemicals division and a photoresist-related equipment division.

Toppan Photomasks, Inc. was founded in 1985 and is based in Round Rock, Texas. Toppan Photomasks, Inc. company’s photomasks are quartz or glass plates that contain precision images of integrated circuits and are used as masters by semiconductor manufacturers to optically transfer these images onto semiconductor wafers. The company, through its wholly owned subsidiary, BindKey Technologies, Inc., develops electronic design automation software that is used by integrated circuit (IC) design engineers to design an IC, which can then be transferred onto photomasks. Its customers include integrated device manufacturers, semiconductor foundries, and fabless semiconductor companies. The company has collaboration with Applied Materials, Inc. for the joint development of advanced photomasks supporting 90nm and 65nm technology.

Towa Intercon Technology, Inc. company makes equipment used in the back end of semiconductor production. After front-end equipment deposits precise layers of materials onto silicon wafers and then etches circuit patterns into these layers, back-end gear gets chips ready for use by cutting apart the wafers and packaging the resulting chips into molded plastic housings. Towa Intercon makes specialized sawing systems that divide wafers into individual chips through a process called singulation. The company also markets chip package molding devices from Japan-based semiconductor equipment maker TOWA. Towa Intercon is a wholly owned subsidiary of TOWA.

Trio-Tech International, Inc. was founded in 1958 and is headquartered in Van Nuys, California. Trio-Tech International (TTI) provides third-party semiconductor testing and burn-in services primarily through its laboratories in Southeast Asia. The Company also designs, manufactures and markets equipment and systems to be used in the process of testing semiconductors at its facilities in California and Southeast Asia, and distributes semiconductor processing and testing equipment manufactured by other vendors. The Company operates in three segments: testing services, manufacturing, distribution and real estate. In April 2009, Trio-Tech International Pte., Ltd. set up a new entity, SHI International Pte., Ltd. (SHI), in which Trio-Tech International Pte., Ltd. holds 55% of the ownership interest. On April 7, 2009, SHI entered into a share purchase agreement, pursuant to which SHI acquired from Erni Susanto Susi, Dwi Kartikarini and PT SAS International shares of PT SAS Heavy Industry (SASHI). SASHI engages in engineering and fabrication work for oil and gas companies.

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