September 30, 2022    Notice of Paint Color Change for Our Products

September 11, 2020    Introducing “OT-1018 Loudspeaker Test System”

April 9, 2020    Our company response to the spread of COVID-19 infections in Japan.

September 3, 2019    OST-726 has been discontinued.

June 25, 2019    Introduction of data recorder OT-1009 for voice coil temperature meter.

January 16, 2015    This web site was redesigned .