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![Chitose City’s Bibi 4 Site: Stone rods](https://static.akarenga-h.jp/en/wp-content/uploads/2015/04/9-005-520x640.jpg)
These stone rods are from 30 to 70 cm long. Older rods have knobs at both ends while newer ones have either a knob at one end or no knobs.
photo courtesy: Hokkaido Archaeological Operations Center