| 1965-09 |
Established as Takasaki sales office of Yokosawa Chemical Co., Ltd. |
| 1965-09 |
横澤化学株式会社高崎営業所として創業 |
| 1967-06 |
Established Koshin Chemical Co., Ltd. to engage in the sale of chemicals as its main business. |
| 1967-06 |
化学薬品の販売を主な業務として高信化学を設立 |
| 1973-06 |
Opened Tatebayashi sales office. |
| 1973-06 |
館林営業所を開設 |
| 1986-05 |
Reorganized Tatebayashi sales office as a branch office. |
| 1986-05 |
館林営業所を支店として組織変更 |
| 1991-07 |
Increased capital to 10 million JPY. |
| 1991-07 |
資本金を1000万円に増資 |
| 2002-07 |
Relocated head office to 801 Oyagimachi, Takasaki City. |
| 2002-07 |
本社事務所を高崎市大八木町801番地へ移転 |
| 2003-01 |
Opened Tokyo sales office in Minato-ku, Tokyo. |
| 2003-01 |
東京都港区に東京営業所を開設 |
| 2008 |
東京営業所を支店として組織変更 |
| 2008-09 |
Merged Saitama regional sales department at the head office and Tatebayashi branch office to establish Saitama branch office. |
| 2008-09 |
Reorganized Tokyo sales office as a branch office. |
| 2008-09 |
本社埼玉地区営業担当部門と館林支店を統合し埼玉支店を新設 |
| 2009-06 |
Opened Kanagawa sales office in Machida City, Tokyo. |
| 2009-06 |
東京都町田市に神奈川営業所を開設 |
| 2010-08 |
Opened Kobe sales office in Kobe City, Hyogo. |
| 2010-08 |
兵庫県神戸市に神戸オフィスを開設 |
| 2012-05 |
Opened Okinawa sales office in Naha City, Okinawa. |
| 2012-05 |
沖縄県那覇市に沖縄オフィスを開設 |
| 2013-04 |
Opened Sapporo sales office in Sapporo City, Hokkaido. |
| 2013-04 |
北海道札幌市に札幌営業所を開設 |
| 2014-04 |
Established Y.T. Holdings with Yokosawa Chemical Co., Ltd. |
| 2014-04 |
横澤化学株式会社とY・Tホールディングス設立 |
| 2015-05 |
Reorganized Kanagawa sales office as a branch office. |
| 2015-05 |
神奈川営業所を支店として組織変更 |
| 2015-06 |
Relocated Saitama branch office, Tokyo branch office, and Kanagawa sales office to their respective current locations. |
| 2015-06 |
埼玉支店・東京支店・神奈川支店を現所在地へ移転 |
| 2018-04 |
Relocated and reorganized Kobe sales office as Kansai sales office. |
| 2018-04 |
神戸オフィスを関西オフィスとして移転及び組織変更 |
| 2018-07 |
静岡県駿東郡長泉町に三島営業所を開設 |
| 2019-06 |
Closed Sapporo sales office due to business integration. |
| 2019-06 |
事業統合により札幌営業所を閉鎖 |
| 2020-07 |
Closed Okinawa sales office due to business integration. |
| 2020-07 |
事業統合により沖縄オフィスを閉鎖 |
