The company history page on the corporate web site of Mitsubishi Pencils provides a reason behind the name: https://www.mpuni.co.jp/en/company/history.html http

The company history page on the corporate web site of Mitsubishi Pencils provides a reason behind the name: https://www.mpuni.co.jp/en/company/history.html https://www.mpuni.co.jp/en/company/history.html It's not clear why the 3 companies got the right to use the same logo. Perhaps they could each demonstrate that they used that logo before Japanese law required for it to be formally submitted for trademark?