History
| 1974 | Kazuo Maruyama and Yukinaga Koike start business in Matsumoto, Nagano prefecture, Japan |
| Circuit Design, Inc. founded as a private limited company | |
| 1981 | OEM supply of wireless microphones to Samson Technologies Corp. starts |
| 1983 | Reorganized as a joint stock company, Circuit Design, Inc. |
| 1989 | Remote engine starter ES-89 released |
| 1991 | Representative office opened in Bremen, Germany |
| OEM supply of engine starters to Japanese automobile company starts | |
| Sales subsidiary CD Trading, Inc. established | |
| 1993 | RF module for Europe exhibited at Hanover Messe |
| 1994 | BZT approved radio module CDP-01 launched |
| Move to new premises completed in Hotaka | |
| 1998 | Capital increased to 40 million yen |
| Radio module business in Japan starts with ARIB approved STD-402 | |
| 2000 | Capital increased to 70 million yen |
| 2001 | Circuit Design GmbH established in Munich, Germany |
| Wireless audio module WA-01 launched | |
| 2002 | ISO 9001 2000 certified |
| 2005 | Anechoic facilities completed |
| 2007 | Change of president. Yukinaga Koike becomes president and Kazuo Maruyama becomes chairman. |
Prehistory of Circuit Design
Early backgrounds of Mr. Maruyama and Mr. Koike
Both of us were interested in radios since we were small. But portable radios were very expensive. At that time, germanium radios were used as a teaching material in children's science lessons. We really looked forward to getting our hands on them.
Publications about the company
Circuit Design, Inc. was founded in 1974 by electronics engineer Kazuo Maruyama(Chairman) and Yukinaga Koike (President). Kazuo Maruyama, who previously worked in the development of hybrid circuits and in the electronics-engineering department of a private company, had a strong interest in wireless audio transmission and this was the reason why he founded his own business – he has been a radio enthusiast for most of his life.