1977
June	Tosei Electrobeam Company Limited founded. Shoji Okabe assumes post of CEO. Electron beam welding machine introduced. Entrusted processing started.
1978
January	He leak tester introduced. Nondestructive tests started.
1979
June	Tamotsu Ueno assumes post of CEO.
1982
June	Acquires land for headquarters.
1983
March	3kW CO2 laser processing machine. Entrusted processing for CO2 laser started.
1986
February	400W YAG laser processing machine introduced. Entrusted processing for YAG laser started.
1989
January	"New Processing Technologies Using Laser" presented at Surface Finishing Society of Japan.
1991
March	50W industrial excimer laser processing machine introduced. Entrusted processing for excimer laser started.
June	"Research on Surface Reforming Technologies Using Laser" granted subsidy from MITI.
1992
August	"Improving the Efficiency and Precision of Ablation Processing Using Excimer Lasers" granted subsidy.
1993
August	Establishment of Network for the Data Communication of Designing Information with Clients and Participating Companies" granted subsidy.
1997
June	CO2 scriber introduced. Entrusted processing for ceramic started.
1998
March	Land for Hamura plant acquired.
April	"Development of Measurement Technologies to Support Energy-Savings in the Production Process of Electronic Devices," research sponsored by Manufacturing Science and Technology Center "Research on Process to Improve Life and Quality of Thermoelectric Elements and Modules through Passivation," research sponsored by National Research Institute for Metals.
1999
April	"Research and Development on Technologies to Formulate Microscopic Through-Hole on Silicon-Base Ultraprecise and Microscopic Multi-Layer Mounting Board," research sponsored by AIST and the University of Tokyo. "Studies on Micro Blood-Sugar Level Sensor in Microdialysis Method" research sponsored by Shizuoka University.
September	Obtained ISO9002 (JQA)
2000
April	"Development of Multi-Layer Mounting Board for Next-Generation Narrow-Pitch Electronic Devices," research sponsored by AIST and the University of Tokyo.
July	"Introduction of Laser-advanced Special Processing" presented at Laser Society of Japan
2001
April	"Technologies on Dies and Molds for Optical Components Compatible with Multi-Wavelength Communication Using Three-Dimensional Ultraprecise Processing Technologies," research sponsored by AIST and Himeji Institute of Technology.
November	"Introduction of Technologies on Precise Processing Using Laser" presented at Japan Society for Precision Engineering
2002
July	"Introduction of Precise Processing Using Laser" presented at Japan Society for Precision Engineering
2003
April	["Research on Casting Microminiature Electronic Devices by Metal Materials," research sponsored by AIST and Tokyo Metropolitan University
2004
October	Awarded Person of Merit from Tokyo (Tamotsu Ueno, CEO)
2004
December	Awarded "Nikkei Manufacturing Award"