|Tokyo Tungsten Co., Ltd.||Year||Osaka Diamond Industrial Co., Ltd.|
|1933||Established Diamond Kenma Co., Ltd. in Nishi-Yodogawa-Ku, Osaka City and began manufacturing and marketing diamond tools.|
|1937||Entered into a capital and technical partnership with Sumitomo Electric Industries, Ltd.|
|Established Katsushika Seiren Co., Ltd (renamed to “Tokyo Tungsten Co., Ltd.” in December the same year) and began to produce tungsten powders.||1939|
|1944||Transferred the Plant to Sakai City. Changed its company name to “Osaka Diamond Industrial Co., Ltd.”|
|Opened Sakata Plant in Sakata City, Yamagata Prefecture.||1945|
|Sumitomo Electric Industries Co., Ltd. made capital investment in the company.||1952|
|Opened Toyama Plant (currently Toyama Works) in Toyama City, Toyama Prefecture.||1958|
|1963||Registered as a listed company in the second section of the Osaka Securities Exchange.|
|Registered as a listed company in the second section of the Tokyo Stock Exchange. Detached Sakata Plant as Tohoku Mineral Industries Co., Ltd.||1964|
|1974||Opened Shizuoka Works in Fujieda City, Shizuoka Prefecture.|
|1980||Entered into a capital and technical partnership with Watanabe Diamond Industries Co., Ltd. (currently Awaji Diamond Industrial Co., Ltd.).|
|1988||Opened Harima Works in Kato-Gun, Hyogo Prefecture.
Made capital investment in Chyi Meei Precison Industry Co., Ltd. in Taiwan.
|1989||Established Osaka Diamond Industries (Singapore) PTE., Ltd. in Singapore.
Watanabe Diamond Industries Co., Ltd. changed its name to Awaji Diamond Industrial Co., Ltd.
|Sumitomo Electric Industries Co., Ltd. made capital investment in Tohoku Mineral Industries Co., Ltd. The company name was changed to Advanced Material Inc. (currently A.L.M.T. TECH Inc.)||1991||Established Osaka Diamond Industries (Thailand) Co., Ltd. in Thailand.|
|Established Sakata Tokyo Tungsten Co., Ltd. (currently A.L.M.T. TECH Inc.) in Sakata City, Yamagata Prefecture.||1994|
|Transferred Tokyo Works’ facilities to Sakata and Toyama Plants and closed Tokyo Works.||1995|
|2000||Tokyo Tungsten Co., Ltd. and Osaka Diamond Industrial Co., Ltd. merged to form A.L.M.T. Corp. on October 1.
Advanced Material Inc. and Sakata Tokyo Tungsten Co., Ltd. merged to establish A.L.M.T. TECH Inc.
|2002||Opened Ono Works in Ono City, Hyogo Prefecture.
Established Henan ALMT Whirlwind Diamond Co., Ltd in China.
|2003||Partly divided and took over A.L.M.T. TECH Inc. and established newly independent subsidiaries, A.L.M.T. TUNGSTEN Corp. and A.L.M.T. DIAMOND Corp.
Transferred the drawing die business of A.L.M.T. Corp to Awaji Diamond Industrial Co., Ltd.
Transferred Osaka Works’ facilities to Harima and closed the Works.
Functional parts business transferred from Sumitomo Electric Industries, Ltd.
|2004||A.L.M.T. Corp. became a wholly owned subsidiary of Sumitomo Electric Industries Co. Ltd. (as of July 30, 2004) and be delisted from the Second Section of the Tokyo Stock Exchange and Osaka Securities Exchange.
Established Henan A.L.M.T. Whirlwind Diamond Wheel Co., Ltd., A.L.M.T. Diamond Dies (SUZHOU) Co., Ltd. and Chengdu Liang Hong Molybdenum Co., Ltd. in China.
|2005||Changed the company name of Osaka Diamond Industries (Singapore) PTE., Ltd. to A.L.M.T. Asia Pacific Pte. Ltd.
Changed the company name of Osaka Diamond Industries (Thailand) Co., Ltd. to A.L.M.T. (Thailand) Co., Ltd.
|2007||Transferred Ono Works’ facilities to Harima and closed the Works.|
|2011||Opened Korat Plant of A.L.M.T. (Thailand) Co., Ltd.|