| 1937 | Started as a "vacuum tube" factory doing subcontract work of Sumitomo Tsushin Kogyo (currently NEC Corporation) at Tokyo. |
| 1943 | Honsha plant moved to Ohtsu-City. |
| 1951 | Hamanaka Seisakusyo Co.,Ltd established. |
| 1957 | Started production of "Hermetic seal parts". |
| 1960 | Miyamachi Plant started operations. |
| 1964 | Started production of "Base for Fluorescent Lamps". |
| 1973 | Started production of "monochrome CRT Parts". |
| 1970 | Head plant rebuilt. |
| 1980 | Started production of "tantalum condenser Parts". |
| 1989 | Started production of "heat fuse parts". |
| 1995 | Started production of "color CRT Parts". |
| 1998 | Washing Specific Chemical Substances were abolished totally. |
| 2002 | Started production of "Back Light Parts for LCD". |
| 2008 | Izumi Syuhara assumed the position of the president. |
| 2009 | Acquired the attestation "Environmental Management System Standard KES Step 2". |
| 2014 | Acquired the attestation "ISO9001 : 2008". |
| 2016 | Installed smoking sections (Preventive measures for passive smoking). |
| 2017 | Acquired the attestation "ISO9001 : 2015". |