From reconstruction to growth: 1946–1956
| 1946 | Obtained permission to lease the Iwahana plant and began production of black powder and fuses. |
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| 1948 |
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| 1947 | The headquarters moved to the Nippon Kayaku Bldg., 15-5, Ichiban-cho, Chiyodaku, Tokyo. |
| 1956 | Technical tie-up with Geigy AG, Switzerland and the production of diazinon, an insecticide, started. |
