July 6, 2020

To whom it may concern,
Company: Tamagawa Holdings, Co., Ltd.
Representative: President, Toru Masuzawa(JASDAQ Code: 6838)
Contact: Management Planning Division, Ryota Tanaka
Tel: 03-6435-6933

Commencement of Research on a Small Atomic Clockand Application Using an Atomic Clock
Please be informed that we, as already notified, have promoted the research and development of optimizing
equipment control / monitoring system for surplus energy which is expected to be utilized in natural energy(solar, wind power, biomass, hot spring heat, etc.) field as a joint research with Specially-appointed Professor
Yasufumi Furuya of Tohoku University as the research representative.

Additionally, for further reinforcementof collaboration, we launched Sendai Office this February.
We have started a joint research of a small atomic clock which is expected to be mounted on mobile terminals,
and the application using an atomic clock with Professor Takahito Ono of Tohoku University as the research
representative. We also developed a prototype of IoT (Internet of Things) system using an atomic clock as thefirst step of the research.

Prototype of IoT (Internet of Things) system using atomic clock
Atomic clock is a clock based on the frequency of electromagnetic wave absorbed or radiated by an atom(also including neutral and ionic).

We have a small atomic clock used for this development besides thecurrently most accurate optical lattice clock, cesium atomic clock used to define seconds, photoion clock,hydrogen maser clock.

The small atomic clock is as approximately 100,000 to 1,000,000 times as accurate as the crystal oscillator
broadly used and has been expected as a clock to be mounted on artificial satellites, for time synchronizationof information communication network, as the standard signal source in the space where GNSS (GlobalNavigation Satellite System) electric wave cannot reach from the artificial satellites. As attempt for low energy
consumption and downsizing are rapidly promoted, there is expectation towards clocks for highly accurate timesynchronization and mounting on the base stations and mobile terminals in the next generation mobile
communication system.
*Reference
National Institute of Information and Communications Technology / Tohoku University / Tokyo Institute ofTechnology
Press release “Atomic Clock into Micromini System Which Can Be Mounted on Smartphones”<https://www.tohoku.ac.jp/japanese/newimg/awardimg/award20180124_01.pdf>
This prototype is an IoT system where the atomic clock synchronizes time accurately at all times and transmits
to the cloud the data on time, latitude and longitude, temperature, humidity and air pressure.
As various devices are connected to the Internet on IoT system, it is necessary to synchronize the time oneach device in order to provide reliability.

IoT system enabling accurate time synchronization is expected tobe utilized in a wide range of fields including more accurate automatic driving, aerospace, robot, medical andwelfare, infrastructure maintenance, virtual power plant control based on the next generation high-speed andhighly concentrated communication.
We will promote development, etc. of small-sized atomic clocks and the application including positioning using
the atomic clock based on this prototype in the joint research with Tohoku University.
Our group will put effort in management as an ESG general trading company which enhances and expands
our accumulated technologies, strategically analyzes and integrates eco-friendly power generation, green
business, communication infrastructure improvement and actively performs a challenge on new businesscreation and corporate revival.