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| 02:56 | Deletion log Acro talk contribs deleted page U.S. Patent 4,346,384 (content was: "'''U.S. Patent 4,346,384''' is a patent by Frederick Raab. It is on electromagnetic tracking systems.<ref name="p291">{{cite web | title=Remote object position and orientation locator | website=Google Patents | date=1980-06-30 | url=https://patents.google.com/patent/US4346384A/ | access-date=2024-08-23}}</ref> ==References== <references /> Category:Patents Category:Polhemus...", and the only contributor was "Acro" (talk)) | ||||