Electronic marker device and method of making same

G - Physics – 08 – B

Patent

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26/112, 340/124.

G08B 1/08 (2006.01) H01Q 1/04 (2006.01) H01Q 1/40 (2006.01) H01Q 7/00 (2006.01)

Patent

CA 1151262

ELECTRONIC MARKER DEVICE AND METHOD OF MAKING SAME Abstract of the Disclosure Passive type electronic marker device is hoop shaped, with the hoop thickness in the radial direction being sub- stantially less than the hoop width in the axial direction and with a tuned circuit disposed within the hoop. Improved structure and the method involves a mandrel portion on which the tuned circuit coil is wound, a mating cover band, and special peripheral hermetic seals.

384878

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