One of these mineral products was nickel, and one of the corporations most interested in its domestic production was then Nihon Kayaku Kogyo (Nihon Kako) which later became Nippon Yakin Kogyo Co., Ltd.
そうした鉱産物の一つがニッケルで、その国産化にもっとも興味をもった企業の一つが後の日本冶金工業となる当時の日本火薬工業（日本火工）だった。