Koken-sha Ltd. was founded in Fukuoka-city

Reorganized and renamed as Koken Shisui Co., Ltd.

• Headquarters moved to Meguro-Ku in Tokyo
• A large boring machine was developed to research coal resources and supplied to coal mines like the Mitsui Miike coal mine.

Japan’s first high-speed rotation machine, “KB drill,” was developed.

• The hydraulic boring machine was supplied to the Tokyo Metropolitan
  Government Bureau of Waterworks for Ogauchi dam construction.
• A high-speed boring machine was supplied for Sakuma Dam. We further expanded the business into the civil engineering and construction industry.

The world’s first submarine boring machine was developed and
supplied for research of undersea coal mines.

The first mixing plant in Japan was supplied for the Kurobe Dam construction.

Japan’s first all-hydraulic boring machine was developed and supplied for subway construction in Tokyo.

• A remote-controlled submarine boring machine, “Marine Drill,” was developed and supplied that was built on the research vessel “Hakuhō-Maru”.
• The first large borehole drilling machine, “BIGMAN BM-1,” was developed.

The Atugi factory was built at the industrial park in Atugi city, Kanagawa pref.

One of the world’s largest horizontal boring machines, “FS-400,” which had been supposed to drill 5,000 m in the Seikan Tunnel, was developed and supplied for Japan Railway Construction Public Corporation.

The large borehole drilling machine “BIGMAN N” series was developed.

One of the world’s largest mixing machines for prepacked concrete was developed with the Honshu-Shikoku Bridge Authority and supplied.

• A super-high pressure grouting pump, “PG pump,” was developed.
• The first overseas office at that time was established in Singapore.

• The first all-hydraulic rotary and percussion machine, “Arrow drill RPD-1” in Japan was developed.
• The long-length horizontal boring machine “BED-100” was developed for advanced drilling in the Seikan Tunnel by a new drilling method that pressurizes circulating water and is supplied for Japan Railway Construction Public Corporation.

• Shield raise boring machine “UPB-75” was developed for a boring vertical shaft.
• “Arrow drill RPD-65” was developed. That spread the opportunity to adopt an anchor drilling method in Japan.
• The large borehole drilling machine “BIGMAN CIVIL RBB-100” was developed.

• A remote-controlled submarine boring machine, “Marine Drill,” was developed and supplied that was built on the research vessel “Hakuhō-Maru”.
• “ICE DRILL MID-140” was developed and supplied to the National Institute of Polar Research for Antarctic research.
• Koken Atsugi factory was completed in 1968, and the surrounding area
• Drilling capacity: 5000 m. Super long-length horizontal boring machine “FS-400” behind the completion of Seikan Tunnel. Supplied in 1969
• Honshu-Shikoku bridge. Underwater prepacked concrete work.

Koken Technical Training Center was established in Shnsyu Enrei Plateau Park.

• Headquarters moved Meguro-ku to Nakano-ku in Tokyo
• Koken’s maintenance department was developmentally established as a spin-off and started 100 %-owned by Koken Machine Service Co., Ltd.
• Full automatic concrete batching plant “Captain” was developed and contributed to work saving and cleanup in civil engineering and construction work.
• “Down The Hole, Drill DD-10” was developed.

• A rotary percussion drill and rail-mounted grouting plant were supplied for tunnel construction of Baikal–Amur Mainline in post-Soviet states.
• Computer-controlled submarine boring machines “Marine Drill MDC-200/10” “MDC-100/100AH” and its marine geological survey tools were developed and supplied for offshore oilfields in Sakhalin, post-Soviet states.

TG-NKK long-distance propulsion tunneling method and dedicated model “FS-120” was co-developed by Tokyo Gas (TG) and Nippon Steel Pipe (NKK) and us.

• The computer-controlled boring robot “ADS-15” was co-developed by Tokyo Electric Power Company (TEPCO) and us.
• Renamed Koken Boring Machine Co., Ltd. at the 40th anniversary of the foundation.

Koken Technical Training Center and a small earth science museum were built in Shnsyu Enrei Plateau Park.

The first prototype machine aimed at Mars exploration was developed by the Institute of Space and Astronautical Science (ISAS), volunteers of Nagoya University, Nishimatsu Construction, Nippon Denso, and us.

• Koken Suwa factory was built in Nagano pref. In the same period, another technical center was also built.
• One of the world’s largest rotary percussion drills, “Arrow drill RPD-200,” was developed.

• The raised boring machine “BM-150” was developed. It was used for Oku-kiyotsu power plant construction in Niigata pref, on the targets: drilling diameter (1.5m), drilling length (250m), and tilt angle (51 degrees).
• A Percussion Wireline Sampler was developed.

Registered for Japan Securities Dealers Association (JSDA) and over-the-counter trading started.

• Restoration work for The Great Hanshin-Awaji Earthquake Disaster in Japan.
• We held a 100% stake in Kozo Kouji Co., which became a subsidiary,
• Japan Home Water System Co. was established for the purpose of developing household water wells.

Koken Earth Museum “地球の宝石箱” was built as a commemorative project for the 50th anniversary of its founding in Shiojiri-city, Nagano pref.

• Koken Machine Service Co., Ltd (subsidiary) was renamed as Boring Techno Service Co., Ltd.
• Meisho Co., Ltd, which manufactured grout flow meters, was established.

Koken earth museum “地球の宝石箱” opened in 1997.

The first overseas production bases were established.

One of the largest raise boring works succeeded on the targets: drilling dia (1.5m), drilling length (250m), and tilt angle (51 degrees) at the site of Tsukumi mine (Oita pref) by Todaka Mining Co., Ltd.

• The soil sampling machine, “Sonic Drill ED-15”, was developed. It had the capacity to drill up to 10 m in depth, even on hard formations.
• A sound-proof and super pulse vibration drilling machine, “K-50”, realized by a unique drill-head (patented), was developed. It had been in compliance with noise regulations in urban civil engineering sites in Japan.
• A multi-purpose crawler drilling machine, “S-150,” was developed that targeted China, Southeast Asia, and EU markets as well as domestic markets.

• House foundation drilling machine “FSP-50AC” was developed. It had a multi-feeding system and realized 8m long-stroke work while it was a small machine.
• A sound-proof and super pulse vibration drilling machine, “K-150,” was developed.
• Over-the-counter trading ended and got listed on JASDAQ.

Headquarters moved Nakano-Ku to Toshima-Ku in Tokyo

The large borehole boring machine (outer diameter 6m) “BM-600” was developed.

• The horizontal directional boring machine “FSC-100” was developed for investigation.
• Became listed on the new JASDAQ market as the result of the Osaka Securities Exchange (OSE) merging the JASDAQ Securities Exchange with OSE’s NEO and Nippon New Market-Hercules (HC) markets.

All hydraulic rotary percussion drill “RPD-160C” was developed with a new drill head “KD-1200” equipped.

• The takeover of a consolidated subsidiary, Meisho Co., Ltd.
• Became listed on the Tokyo Stock Exchange (TSE) JASDAQ “STANDARD” market as the result of the integration of the Osaka Securities Exchange (OSE) and the Tokyo Stock Exchange (TSE).
• The horizontal drilling machine “FS-120CZ” was developed for emergency rescue work.

Transition to a company with an audit and supervisory committee.

• Yangon branch was established as an overseas base in Myanmar.
• The spindle-type boring machine “KT-100” was manufactured overseas.

All hydraulic rotary percussion drill “RPD-180C” was developed with an engine in compliance with the 4th gas regulations in Japan.

Capital and business alliance with Enbio Holdings, Inc.

• Entered into a contract for acquiring land and buildings in the Isehara Industrial Park and transferring land and buildings for the Atsugi factory.
• Initiated development of next-generation products focusing on safety, labor-saving, and productivity improvement. Started the design and fabrication of two models of medium-sized RPD machines: RPD-75SHF and RPD-70-DFC, three models of rod handling devices, medium-capacity piston pump MG-60V, ultra-high pressure pump PG-150V, and medium-sized automated plant KMPA-VM1000.

Transitioned to the Standard Market due to the market reorganization of the Tokyo Stock Exchange.