It was a time when Japan relied on imported gas meters from overseas.
Founder Daigen Jumonji felt the need for a domestically produced gas meter, and using his home as a workshop, he and the engineers he was working with at the time began development of a meter.
After about two months of tireless research, the Jumonji Dry-type A gas meter passed the rigorous tests conducted by Tokyo Gas and was ordered by the company.
Thus, Japan's first gas meter was born.

A factory is built in Kanda-ku, Tokyo, a sales office is established in Shitaya-ku (now Taito-ku), and the name of the store is changed to Kimmon Trading.
Daigen becomes the first merchant owner and begins selling gas meters and gas appliances.

While gas meter manufacturing continued to make steady progress and sales increased year after year, Daigen also began researching water meters.
Around this time, major cities across Japan were increasingly shifting from a "flat rate system" to a "metered rate system" due to the increase in water consumption.
At a time when water usage measurement, like gas meters in the past, relied on imports from overseas, Daigen decided to manufacture water meters.
The production of water meters was very difficult, and other precision companies were unable to put them to practical use.
However, Daigen continued his meticulous research without changing his mind and eventually completed two types of sophisticated water meters.
Japanese cities recognized the excellence of the meters and adopted Kimmon’s water meters one after another.