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This is a boring bit, although not the one they used, showing how big it is, and how they insert a battery-operated transceiver inside to track its location (including depth).
E_BoringBit.jpg (788 Kb) (under photos/20/0511-16_NewHouseWaterLine/)
By Alan Silverstein, ajs@frii.com (page updated Sun Mar 9 14:33:54 MDT 2025)