| 1958/12 |
Establishment of the company |
| 1960/4 |
Began environmental maintenance-related businesses including septic tank maintenance and management, management of waste treatment, measurement and analysis of water quality and chemical substances, environmental research and consulting, and total management |
| 1965/4 |
Contracted the operations of water quality management of Meishin Expressway from Japan Highway Public Corporation |
| 1968/9 |
Started business in cleaning water receiving tanks, cleaning pipelines and the maintenance and management of community plants. |
| 1969/11 |
Started sales of pharmaceuticals and industrial chemicals (deleterious and poisonous substances). |
| 1976/3 |
Registered for environmental measurement certification business (concentration). |
| 1978/1 |
Designated as authorized analyzing institution (potable water test) by the Ministry of Health and Welfare. |
| 1978/1 |
Designated as authorized analyzing institution (management of water receiving tank and air environment measurement) by the Ministry of Health and Welfare. |
| 1979/3 |
Registered for environmental measurement certification business (noise and vibration). |
| 1979/6 |
Designated as an authorized measuring institution for working environment measurement by the Labor Standards Office. |
| 1979/1 |
Licensed for industrial waste disposal business. |
| 1980/6 |
Commended by the Shiga prefectural governor as an excellent organization in the promotion of environmental conservation. |
| 1981/1 |
Registered for electrical work business. Licensed for waste metal trading. Licensed for secondhand articles dealing. |
| 1983/4 |
Commissioned to provide an examination facility for national technical certifications examinations (chemical analysis). |
| 1983/12 |
Commissioned to carry out maintenance and management of Otsu Clean Center by Otsu Clean Center by Otsu Industrial Waste Processing Public Corporation. |
| 1984/4 |
Commissioned to carry out total operation and management of Okishima Sewage Treatment Center by Sewage Works Section of Ohmihachiman city. |
| 1984/6 |
Licensed for general construction business. |
| 1984/12 |
Affiliated with Shiga Environment Maintenance Cooperative Association and designated as analyzing institution by the Association. |
| 1984/12 |
Commissioned to carry out maintenance and management of Maki Purification Plant by Water Supply Office of Ohmihachiman city. |
| 1985/1 |
Registered for septic tank maintenance business by Shiga, Gifu and Aichi prefectural governments. |
| 1986/4 |
Commissioned to carry out the maintenance and management of relay pumps of the Konan Chubu regional sewerage system. |
| 1986/5 |
Registered as a working environment measuring institution under the Cooperative Safety and Hygiene Improvement Promotion Program for Small Businesses by Japan Industrial Safety and Health Association |
| 1987/6 |
Licensed for the sale of general high-pressure gas. |
| 1988/3 |
Registered for maintenance and management of sewage treatment facility by the Ministry of Construction, No. 62-53. (Only one in Shiga prefecture) |
| 1989/2 |
Registered for pesticide sales business. |
| 1989/7 |
Registered for fertilizer sales business. |
| 1989/12 |
Received note of appreciation by the Shiga prefectual governor for great contributions to technical training of overseas technical trainees. |
| 1992/11 |
Received note of appreciation for contribution to national technical certificate examination (chemical analysis). |
| 1994/1 |
Change the company name to HIYOSHI corporation |
| 1994/7 |
Licensed for general motor truck carrier business |
| 1996/11 |
Commended by the minister of Labour for contribution to national technical certifications. |
| 1997/1 |
Completion of Technical Center |
| 1997/11 |
Commended for international contribution on environmental problems. |
| 1999/3 |
Certified for designated water testing institution by the Ministry of Health and Welfare. |
| 2000/6 |
Contracted for CALUX® Assay license agreement with Xenobiotic Detection Systems International, Inc. |
| 2001/5 |
Registered of poisonous and hazardous substances manufacturing business. |
| 2001/8 |
Certified for contracted research on Dioxin measurement by ministry of the Environment (for year 2001) |
| 2002/1 |
Registered for Clinical testing Institution. |
| 2002/4 |
Certified for contracted research on Dioxin measurement by ministry of the Environment (for year 2002-2003) |
| 2002/4 |
Commissioned to carry out maintenance and management of Mabuchi Purification Plant of Shiga prefectural Chubu Water Office. |
| 2002/11 |
Awarded first Shibusawa Eichi award from the governor of Saitama prefecture. |
| 2002/12 |
Contracted for CALUX sole-agent in Japan with XDS |
| 2002/12 |
Registered for Specified Measurement Laboratory Accreditation |
| 2003/1 |
Registered for Specified Research Laboratory under Soil Contamination Countermeasures Law |
| 2003/3 |
Obtained ISO9001 certificate |
| 2004/3 |
Registered for Water Quality Testing Laboratory accreditated by Ministry of Health, Labour, and Welfare. |
| 2004/10 |
Registered for Food Hygienic Testing Laboratory under Food Sanitation Law. |
| 2005/3 |
Registered for Feed Testing Laboratory under Law concerning the Safety and Quality Improvement of Feed |
| 2005/4 |
Registered for Hotspring Testing Laboratory |
