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[[http://www.sonion.com Sonion]] T 20 AG telecoil usually used in hearing aids.]]+
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[[Image:Dry_elphel_model_1_rcvr_coils.jpg|thumb|each of the three receiver coils is ten millimeters long, and is a
[[Image:Dry_elphel_model_1_rcvr_coils.jpg|thumb|each of the three receiver coils is ten millimeters long, and is a
−Sonion T 20 AG telecoil used in hearing aids.]]
Open source electromagnetic trackers are trackers that have designs publicly available. [[Peter Traneus Anderson]] has made contributions in this area.
Open source electromagnetic trackers are trackers that have designs publicly available. [[Peter Traneus Anderson]] has made contributions in this area.