| 1946-11 |
横浜市西区平沼に会社（本社）を設立 |
| 1946-11 |
Established company (headquarters) in Hiranuma, Nishi-ku, Yokohama. 会社設立時、このビルの2階に本社を構えた. |
| 1948-04 |
南氷洋捕鯨船団に対する電波探信儀の装備、保守整備及び修理業務を開始する |
| 1948-04 |
The company begins equipping, maintaining, and repairing radio frequency detectors for the whaling fleet in the Antarctic Ocean. |
| 1952-04 |
海上警備隊の発足とともに艦船搭載のエレクトロニクス関係機器の修理、オーバーホール業務を開始する |
| 1952-04 |
With the establishment of the Maritime Patrol Force, the company began repair and overhaul operations of electronics-related equipment on board ships. |
| 1955-06 |
海上自衛隊 護衛艦「ゆきかぜ」のぎ装支援業務を三菱重工（株）神戸造船所で開始する |
| 1955-06 |
Began outfitting support operations for the Maritime Self-Defense Force destroyer Yukikaze at the Kobe Shipyard of Mitsubishi Heavy Industries, Ltd. |
| 1958-03 |
空中線及び関連機器等の研究開発業務を開始する |
| 1958-03 |
Begins research and development work on aerials and related equipment, etc. |
| 1959-06 |
海上自衛隊の航空機搭載電子機器の修理、オーバーホール業務を開始する |
| 1959-06 |
The company began repair and overhaul operations of aircraft-mounted electronic equipment for the Maritime Self-Defense Force. |
| 1968-10 |
潜水艦に搭載する通信用空中線及び関連機器等の設計製造業務及び保守整備を開始する |
| 1968-10 |
Begins design, manufacturing, maintenance and servicing of communication aerials and related equipment for submarines. |
| 1969-05 |
本社・工場を新築・移転（横浜市中区かもめ町） |
| 1969-05 |
Head office and factory relocated (Kamome-cho, Naka-ku) Head office. |
| 1971-11 |
海上自衛隊の新造艦武器システムのシステムエンジニアリング業務を開始する |
| 1971-11 |
The company begins system engineering work for the Maritime Self-Defense Force's new ship weapon system. |
| 1974-08 |
レーザー応用機器の設計製造業務を開始する |
| 1974-08 |
The company begins designing and manufacturing laser-applied equipment. |
| 1983-11 |
財団法人防衛装備協会賞を受賞する |
| 1983-11 |
Received the Defense Equipment Association Award. |
| 1985-11 |
財団法人防衛装備協会賞を受賞する |
| 1985-11 |
Received the Defense Acquisition Association Award. |
| 1986-08 |
対潜哨戒機（P-3C）搭載電子機器の修理業務を開始する |
| 1986-08 |
Begins repair work of electronic equipment on board anti-submarine patrol aircraft (P-3C). |
| 1988-11 |
海上自衛隊新造イージス艦の武器システムエンジニアリング業務を開始する |
| 1988-11 |
The company began weapons systems engineering services for the newly built Aegis ships of the Maritime Self-Defense Force. |
| 1990-09 |
防衛庁長官から感謝状を授与される |
| 1990-09 |
Received a letter of appreciation from the Director General of the Defense Agency. |
| 1994-11 |
横浜市金沢区に福浦工場を開設 |
| 1994-11 |
財団法人防衛装備協会賞を受賞する |
| 1994-11 |
Received the Defense Acquisition Association Award. |
| 1996-11 |
創立50周年 |
| 1996-11 |
50th anniversary of foundation. |
| 2000-04 |
JIS Q 9001（品質マネジメントシステム（QMS））認証取得 |
| 2000-04 |
Gained Certification for JIS Q 9001 (Quality Management System (QMS)) certification. |
| 2002-07 |
三菱電機、ロッキードマーチン、三菱商事との合弁会社 「（株）エム・エル・エス」を創立 |
| 2002-07 |
MLS Ltd. was established as a joint venture with Mitsubishi Electric Corporation, Lockheed Martin Corporation, and Mitsubishi Corporation. |
| 2004-10 |
本社・工場を横浜市金沢区福浦に移設し、福浦工場と統合 |
| 2004-10 |
Head office and factory opened in Kanazawa-ku, Yokohama, and the Yokohama area factories were integrated. |
| 2006-08 |
JIS Q 14001（環境マネジメントシステム（EMS））認証取得（本社・工場） |
| 2006-08 |
Gained Certification for JIS Q 14001 (Environmental Management System (EMS)) certification (head office and factory). |
| 2007-04 |
本社に水中機器（送受波器）整備工場を新設 |
| 2007-04 |
An underwater equipment (transmitter/receiver) maintenance shop was newly established at the head office Transmitter/receiver test water tank. |
| 2009-03 |
JIS Q 27001（情報セキュリティマネジメントシステム（ISMS）） 認証取得 |
| 2009-03 |
Obtained JIS Q 27001 (Information Security Management System (ISMS)) certification. |
| 2013-11 |
公益財団法人防衛基盤整備協会賞を受賞する |
| 2013-11 |
Received the Defense Infrastructure Development Association Award. |
| 2017-10 |
防衛大臣から感謝状を授与される |
| 2017-10 |
Received a letter of appreciation from the Minister of Defense. |
| 2018-10 |
本社・工場に北棟竣工 |
| 2019-01 |
JIS Q 9100認証取得（品質マネジメントシステム（AQMS））認証取得（本社・工場） 「認証範囲：航空機搭載用特定装備品のサービス提供（保守整備等）」 |
| 2019-01 |
Completion of the North Wing of the Head Office and Plant 本社・工場北棟 |
| 2019-10 |
本社・工場に電波暗室棟竣工 |
| 2019-10 |
JIS Q 9100 certification (Quality Management System (AQMS)) certification (head office and plant) "Scope of certification: provision of services (maintenance, servicing, etc.) for specified equipment for onboard aircraft" |
| 2023-11 |
公益財団法人防衛基盤整備協会賞を受賞する |
| 2023-11 |
Completion of an anechoic chamber building at the head office and plant 電波暗室 電波暗室 |
| 2023-11 |
Received the Defense Structure Improvement Association Award from the Defense Structure Improvement Association. |
| 2024-08 |
米国レイセオン社と米海軍向け艦載レーダ用構成品の製造に関する契約を締結 |
| 2024-08 |
Signed an agreement with Raytheon to manufacture shipboard radar components for the U.S. Navy. |
