Patent List :

1. Underground Pipe Detection System, US Patent 3967282, June, 29, 1976.
2. Underground Pipe Detection System, US Patent 4062010, Dec., 6, 1976.
3. Underground Time Domain Electromagnetic Reflectometry for Digging Apparatus, US Patent 4006481, Feb., 1, 1977.
4. Pulse Shaper for Coaxial Cable System, US Patent 4066970, June, 3, 1978.

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