Brief History

Sept. 1948
Goko Seisakusho Co. Ltd. was founded to manufacture and sell mainly bus components and parts.
Nov. 1950
Meguro Works began operation at Nakane-cho, Meguro-ku, Tokyo.
Mar. 1951
Orders were received for diesel-car transmissions, reversing gears, reduction gears and freight-car shifters from Japanese National Railways (JNR), the forerunner of the present Japanese Railways (JR).
Jan. 1953
Orders were received from the Defense Agency of Japan for 50 units of cold-proof starters (rapid charging equipment and combustion heaters), about 1,000 units of combustion heaters for chemical fire trucks, repair cars and hospital cars and 60 units of ground heaters for aircrafts.
1955
An order was received for combustion heaters for diesel cars from JNR.
An order was received for electric heating defrosters for railway vehicles (especially for cabs). Such defrosters are in growing use for electric trams, locomotives and diesel cars throughout the country.
Combustion heaters for buses were put on sale.
(Orders have since been received from many sectors of industry for them, as well as their variations for naval vessels, aircrafts, special vehicles, motor dynamos and dryers.)
May. 1964
Circulating sewage treatment units for buses were developed for the JNR's Automobile Bureau, with a research subsidy from the Transport Ministry. (Such units have since been adopted widely in Tomei/Meishin Expressway buses, trunk road highspeed buses, long-distance coaches, sightseeing buses and the like.
1967 - 1969
Circulating sewage treatment units were adopted for JNR's Tokaido Super express trains.
Circulating sewage treatment units were also adopted for JNR's existing lines.
1972 - 1973
Various types of sewage treatment units for ships were put on sale.
Goko's marine vessel Sewage treatment unit were selected for use on Self-Defense Force vessels, and have been used ever since.
1978 - 1981
USCG type-test certification granted for Cleanpet circulating Sewage treatment units (TCP) for marine vessels and for Aerobict Sewage treatment units (TF) of contact-aeration type for marine vessels.
Jan. 1982
Circulating Sewage treatment units were selected for use in JNR 200-type Tohoku and Joetsu Super Express trains.
1983 - 1984
UK Department of Trade certification granted for the Aerobict (TF).
Installation of the Aerobict (TF) in U.S. flagships approved by USCG.
USCG certification granted for the Cleanpet 7M, a new type of circulating Sewage treatment unit for marine vessels and for Aerobict C (TFC) wastewater treatment units of contact-aeration type for marine vessels.
Jan. 1991
The EVAC vacuum toilet system, manufactured under the license of EVAC in Sweden and Finland, was put on sale.
1992 - 1993
The vacuum type toilet system was formally adopted for mass produced cars for the limited express Tsubame (EC787) of Kyushu Japan Railway for the first time in Japan.
The vacuum type toilet system was adopted for EC23000-type cars for the limited express Ise of Kintetsu Corporation.
1995 - 1997
The vacuum type toilet system was adopted for TEC500-type cars for Shinkansen trains of West Japan Railway Company, together with GOCO Water supply equipment.
The vacuum type toilet system was adopted for E2-type cars for Tohoku and Nagano Shinkansen trains of East Japan Railway Company, together with GOCO Water supply equipment.
GOCO compact vacuum toilet system was adopted, together with GOCO Water supply equipment, for TEC700-type cars for Tokaido and Sanyo Shinkansen trains of Central Japan Railway Company and West Japan Railway Company.
Apr. 2001
ISO9001:2000 accreditation granted for quality.
2004 - 2005
The Ministry of Land Infrastructure and Transport certification granted for Aerobict (TF) Sewage treatment units of contact-aeration type.
The Ministry of Land Infrastructure and Transport certification granted for Aerobict C (TFC) Sewage treatment units of contact-aeration type.
Sep. 2006
Kawamura Co.,Ltd was acquired, merged to be its Yamguchi.
July. 2007
GOCO compact vacuum toilet system was adopted, together with GOCO water supply equipment, for TEC N700-type cars for Tokaido and Sanyo Shinkansen trains of Central Japan Railway Company and West Japan Railway Company.
Apr. 2009
Yamguchi Works obtains ISO9001:2000 accreditation for quality.
Apr. 2010
The Ministry of Land Infrastructure and Transport certification granted for Sewage treatment equipment unit for marine vessels (type TFe).
 
Aug. 2012
GOCO compact vacuum toilet system was adopted, together with GOCO water supply equipment, for TEC N700A-type cars for Tokaido and Sanyo Shinkansen trains of Central Japan Railway Company and West Japan Railway Company.
Oct. 2013
Vacuum toilet system was adopted, together with GOCO water supply equipment, for Cruise train "Seven stars" of Kyushu Japan Railway Company.

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