For inquiries or information

TEL: +81-80-1928-8778

Business hours

9:00 ~ 17:00 (Monday ~ Friday)

Handmade printed original goods only for you

Electricity saving tech. development story serially posted in  Japanese and English

In Kampala, Uganda in September, 2008
In Kampala, Uganda in September, 2008 as a member of Investment Promotion & Observation Team both by Japanese Government and Private sectors

Office KTK was established in Onomichi-city, Hiroshima in Japan in 1977 as a translator's and interpreter's office for SMEs. Since then we have served for many companies, groups and individuals with its business policies of contribution to internationalization, natural environment and local communities.


KEC Inc., the predecessor of Office KTK, has been an electronic and chemical technology development company and it worked on developing the electricity saving technologies and the devices (named SOD) between 1994 and 2012. It won Energy Conservation Award in 1997 as the smallest company ever and the technology has been transferred to NTT-AT. (3D rotatable images of SODs)

The SOD also has received two other prominent awards, making us a triple awards winner


This SOD technology has now been applied to Internet SOD as IoT (Internet of Things) as well.(Introductory video at the exhibition


Office KTK is now newly operating "Online English learning support" and Tour Guide for non-Japanese as the language related business.           

This website also has a blog pagehobby pagesregional volunteer activity pages as well as TV and radio program production recorded pages.


                           Thank you. 


Notice: The homepage site of KEC Inc. ( and its E mail address were closed on December 31, 2013.

STEP 1st Graders Network

Volunteer activity

Free English Learning Society

Volunteer activity

Classic guitar playing 

Hobby activity

Introduction of KTK & Technologies by medias

Introduction by TVs 

Coverage by newspapers and magazines (~2012)

Coverage by newspapers and magazines (2013~)

Introduction by videos 

KTK Homepage 

Career history (Karl Kamamoto)

Hobby introduction (Karl Kamamoto) 

Volunteer & Hobby (Karl Kamamoto)

SOD technology now has been being upgraded into IoT technplogy.

                                                                   For further information, please visit here.

  This technology development story now serially appears in Japanese and in English alternate

The following pictures show the overseas and its related activities

More pictures are here.

Please listen to those while surfing our home pages.

Music Space 2010an original guitar music for us,

               compsed by A. Kitagawa, a guitarist


La Playa      Barcarole      Feste Lariane

Recuerdos de la Alhambra   Amazing Grace

Lagrima   II Ferroviere    Dream of Love No. 3

               played by the site owner, Karl Kamamoto


L' estro Armonico / SORA,

     a classic guitar group, Karl Kamammoto  

News updates

August 04, 2021  'STEP 1st Graders' Network in Japan', renewal of data
July 23, 2021 New printing brand MyPrint, preparatory work started
April 12, 2021  'STEP 1st Graders' Network in Japan' introduced on TV
Feb. 18, 2021  SDGs Super Ecology Dyeing Laboratory opened
Jan. 08, 2021   Multi-use rental room opened
Jan. 01, 2021 

 A Happy New Year  with a music of my own playing

November 12, 2020 Newspaper coverage and TV coverage in commemorating of the 40th anniversary of Onomichi Free English Learning Society (Onomichi ESS)
August 27, 2020  Power-saving way of telephones, faxes, etc released on video
August 04, 2020

English learning support at Onomichi Glocal Labo started

June 15, 2020

Japanese - English translation service for personal writings started

June 01, 2020

Eiken 1st Graders (& equiv.) Network, Japan

Registration support for to-be examiners re-started

May 15, 2020 Worldwide English, Japanese Language Exchange Network opened
April 20, 2020 Renewal of tenant office / shop, KEC Building 
 January 13, 2020  Developing story of Electricity Saving Device named SOD (Switch on demand) started being published on STORYS. 
 January 09, 2020  Office / Shop for rent for any nationality, KEC Building
 January 01, 2020  Happy New Year!

   News in the past is listed here.

                                     HOME PAGE MENU, OFFICE KTK

                      Copyright©1994 -   Office KTK   All rights reserved.