| April,1942 | Yamamoto Seiki Co.,LTD.is established as a supplier to Shimazu Seisakusho Co.,LTD, |
|---|---|
| November,1955 | Construct factory and dormitory at current head office |
| April,1960 | Become supplier for Shoufu Toshi Seizo Co.,LTD |
| November,1960 | Rebuild Factory at current site of head office |
| January,1961 | Incorporated with capital of 2,000,000 Yen Ryuzo Yamamoto become managing director |
| November,1962 | lnvest capital increases to 4,500,000 Yen |
| March,1967 | Capital increases to 7,000,000 Yen |
| April,1968 | Capital increases to 10,000,000 Yen |
| November,1968 | Kisshoin Factory construction completed |
| Februaly,1970 | Receive osaka Bureau of International Trade and Industry President's Award for excellence in business management |
| April,1970 | Capital increases to 15,000,000 Yen |
| September,1970 | Receive Kyoto Mayor's Award for Excellence in enterprise evaluation |
| Nobember,1970 | Receive Bureau of Small and Medium-sized BusinessDirector's Award for excellent factory facilities |
| April,1971 | Capital increases to 20,000,000 Yen |
| April,1973 | Receive Bureau of Small and Medium-sized Business Model Factory Award |
| May,1973 | Adjustment factory and design room is added |
| April,1975 | Receive Bureau of Small and Medium-sized Business Model Factory Award for the second time |
| July,1976 | Become supplier for Murata Seisakusho Co.,LTD. |
| April,1977 | Receive Bureau of Small and Medium-sized Business Model Factory Award for the third time |
| April,1979 | Received Bureau of Small and Medium-sized Business Model Factory Award for the fourth time |
| December,1979 | Akira Yamamoto replaces Ryuzo Yamamoto,the founder,as managing director |
| March,1980 | Receive the Kyoto City Mayor's Award for Excellence at the First Kyoto City Workplace original Invention Exhibition |
| April,1981 | Receive Bureau of Small and Medium-sized Business Model Factory Award for the fifth time |
| April,1981 | Capital increased to 30,000,000 Yen |
| April,1983 | Receive Bureau of Small and Medium- sized Business Model Factory Award for the sixth time |
| April,1985 | Receive Bureau of Small and Medium-sized Business Model Factory Award for the seventh time |
| April,1987 | Received Bureau of Small and Medium-sized Business Model Factory Award for the eigth time |
| October,1987 | New building is completed for Kisshoin Factory |
| March,1988 | Receive the Kyoto Invention Association President's Award at the Eighth Kyoto City Workplace original Invention Exhibition |
| March,1989 | Receive the Bureau of Small and Medium-sized Business Director's Award |
| Apri1,1989 | Received Bureau of Small and Medium-sized Business Model Factory Award for the ninth time |
| Apri1,1990 | Akira Yamamoto becomes chairman. Yoshiyuki Yamamoto becomes managing director |
| May,1999 | ISO9001 acquisition |
| March,2017 | Yoshiyuki Yamamoto becomes chairman. Atsuhiko Yamamoto becomes managing director |
