Sarah Burstein on Nostr: U.S. Patent No. 4,378,116 - issued to Ernö Rubik in 1983 for a "spatial logical ...
U.S. Patent No. 4,378,116 - issued to Ernö Rubik in 1983 for a "spatial logical toy." #UtilityPatents
Sarah Burstein /
npub1nmh…8zqg
2024-02-21 17:07:33
Author Public Key
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2024-02-21 17:07:33Event JSON
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