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Chris Allen, Gregory Stump. Vermeer Manufacturing Company, Inc., Apparatus and method for detecting a location and an orientation of an underground boring tool. U.S. Patent 6,435,286 August 20, 2002. (pdf)
Hok Yong Pua, Chris Allen, Ken Demarest, Ron Hui, Kumar Vijay Peddanarappagari. Sprint Communications Company, L.P., Method and Apparatus to Compensate for Polarization Mode Dispersion. U.S. Patent 6,459,830 October 1, 2002. (pdf)
Ron Hui, Jin Hong, Maurice O'Sullivan. Nortel Networks Limited, Method and device for encoding data into high speed optical train. U.S. Patent 6,438,148 August 20, 2002.
Chris Allen, Gregory Stump. Vermeer Manufacturing Company, Trenchless Underground Boring System with Boring Tool Location. European Patent EP0873465B1 March 27, 2002. (pdf)
G. S. Stump, C. T. Allen. Vermeer Manufacturing Company, Trenchless underground boring system with boring tool location. European Patent EP1227343A2 July 31, 2002. (pdf)
Chris Allen, Gregory Stump. Vermeer Manufacturing Company, Trenchless Underground Boring System with Boring Tool Location. Ireland Patent 0873465 March 27, 2002. (pdf)