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==Patents==
==Patents==
* [[U.S. patent 5,640,170]] (Polhemus)
* [[U.S. patent 5,640,170]] (Polhemus)
+* [[US7715898B2]]
* [[US7834621B2]] - Electromagnetic tracking employing scalar-magnetometer<ref>https://patents.google.com/patent/US7834621B2/en</ref>
* [[US7834621B2]] - Electromagnetic tracking employing scalar-magnetometer<ref>https://patents.google.com/patent/US7834621B2/en</ref>
* [[US7907701B2]] - Electromagnetic coil array integrated into antiscatter grid<ref>https://patents.google.com/patent/US7907701B2/en</ref>
* [[US7907701B2]] - Electromagnetic coil array integrated into antiscatter grid<ref>https://patents.google.com/patent/US7907701B2/en</ref>