| 1944 |
Founded Kobayashi Riken Manufacturing Co., Ltd. (now our company) in 1944 |
| 1946 |
Launched microphones (M-101) and pickups (P-101) using Rochelle salt piezoelectric vibrators |
| 1948 |
Launched Japan's first mass-produced hearing aid (H-501) |
| 1950 |
Hearing aids designated as items under the Welfare of the Disabled Law |
| 1952 |
Launched audiometers (A-1002 for hearing tests) |
| 1954 |
Established Osaka Service Station (now Nishi-Nihon Sales Office) |
| 1955 |
Launched noise meters (N-1101) |
| 1956 |
Launched transistor hearing aids (H-530), hearing test room (AT-2), and viscometers (RV-1501) |
| 1959 |
Launched Nystagmus meter (NY-2301) |
| 1960 |
Established Rion Metal Industries Co., Ltd. (now a consolidated subsidiary), and renamed Kobayashi Riken Manufacturing Co., Ltd. to Rion Co., Ltd. |
| 1961 |
Established Rionnet Center |
| 1962 |
Launched Rionocorder (RR-01), a disc-type recording and playback device |
| 1963 |
Established Sendai Branch Office (now Sendai Sales Office) |
| 1964 |
Launched behind-the-ear hearing aids (HA-07) and piezoelectric ignition device Rionospiker (PE-01) |
| 1965 |
Launched Vibration Meter (VM-01) |
| 1969 |
Established Tohoku Rion Co., Ltd. (liquidated in March 2010) and launched brain wave summation device (AR-03) |
| 1970 |
Acquired Komiya Electric Co., Ltd. (now a consolidated subsidiary, Kyushu Rion Co., Ltd.) and launched the world's first digital noise meter (NA-10) |
| 1971 |
Received the first Good Design Award in Japan for hearing aids (HA-27 series) |
| 1972 |
Opened the Nagoya branch (now Tokai Sales Office) |
| 1974 |
Opened the Hiroshima branch (closed in May 2002, now integrated into West Japan Sales Office) and obtained type approval under the Metrology Law for the first noise meter in Japan (NA-09, NA-07A) |
| 1977 |
Released the airborne particle counter (KC-01) |
| 1979 |
Established Liyun Electronics Industrial Co., Ltd. in Taiwan (sold in October 2013) |
| 1980 |
Released the seismometer (SM-10) |
| 1981 |
Released the world’s first transistor-type micro wind speed meter (AM-02, AM-03) and the automatic noise suppression hearing aid (ANS) (HA-39AS) |
| 1983 |
Successfully developed the world’s first artificial middle ear and released the wireless CROS bone-conduction eyeglass-type hearing aid (HE-72) |
| 1984 |
Released the custom hearing aid (HI-02), the water-resistant ear-mount hearing aid (HB-35), and the first Japanese liquid particle counter (KL-01) |
| 1986 |
Released the world’s first waterproof ear-mount hearing aid (HB-35PT) and the 1/N octave real-time analyzer (SA-26) |
| 1991 |
Released the world’s first digital hearing aid (HD-10) |
| 1993 |
Obtained ISO 9001 certification for noise meters |
| 1995 |
Obtained ISO 9001 certification for all products except noise meters |
| 1996 |
Listed on the over-the-counter market, established R & I Ltd. (now non-consolidated subsidiary), and released the hearing aid with the "omakase circuit" (HB-55S) |
| 1997 |
Acquired International Hearing Aid Co., Ltd. (formerly consolidated subsidiary Kanto Rion Co., Ltd.) and made it a subsidiary |
| 1998 |
Obtained CE certification (93/42/EEC) |
| 1999 |
Obtained ISO 14001 certification |
| 2000 |
Listed on the Tokyo Stock Exchange Second Section |
| 2002 |
Established Lion Service Center Co., Ltd. (now consolidated subsidiary) and Lion Tech Co., Ltd. (now consolidated subsidiary), and opened a European representative office in the Netherlands |
| 2004 |
Operated the first Japanese automatic hearing aid shell production system "Lionet Dream Ear Workshop" |
| 2005 |
Released the world’s first waterproof custom hearing aid (HI-G4WE), obtained ISO13485 certification, Kyushu Rion Co., Ltd. acquired Fukuoka Hearing Aid Center Co., Ltd. and made it a subsidiary. |
| 2006 |
Established Rion Measurement Instrument Sales Co., Ltd. (liquidated in November 2012), established Tokai Rion Co., Ltd. (now a consolidated subsidiary), and achieved a cumulative shipment of 6 million hearing aids. |
| 2008 |
Opened a Tokyo office. |
| 2009 |
Acquired HearingLink Ltd. (formerly consolidated subsidiary Tokyo Rionet Sales Co., Ltd.) and made it a subsidiary. |
| 2010 |
Opened a China representative office (closed March 2013) and launched the first domestically produced handheld OAE screener (ER-60). |
| 2011 |
Designated as a First Section TSE listing and succeeded in developing the world’s first biological particle counter. |
| 2012 |
Opened the East Japan office (closed March 2016) and established Shanghai Liyin Trading Co., Ltd. (now a non-consolidated subsidiary) in China. |
| 2015 |
Established Shanghai Liyin Technology Co., Ltd. (now a non-consolidated subsidiary) in China. |
| 2017 |
Released the world’s first bone-conduction hearing aid. |
| 2018 |
Established East Japan Rion Co., Ltd. (now a consolidated subsidiary) by merging Kanto Rion Co., Ltd. and Tokyo Rionet Sales Co., Ltd. |
| 2020 |
Released the world’s first wireless charging system for hearing aids and the world’s first fully cordless audiometer. |
| 2022 |
Transitioned to the TSE Prime market, acquired Norsonic Co., Ltd. (now a consolidated subsidiary) and made it a subsidiary. |
