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![Taisho 7 Site: Blades and blade arrowheads](https://static.akarenga-h.jp/en/wp-content/uploads/2015/04/8-002-695x533.jpg)
Unique arrowheads known as blade arrowheads were introduced in the northeastern part of Hokkaido around 7,000 years ago due to influences of Siberia and other Asian continent areas.
photo courtesy: Obihiro Centennial City Museum