[2] Gutauskas P L. RAILROAD FLAT WHEEL DETECTORS:United States Patent, 5,133,521 [P].1992-7-28.
[4] Wayside Monitoring Alliance. PRODUCTS [DB/OL]. http://www.waysidealliance.com/product.htm, 2004/2013.
[2] Gutauskas P L. RAILROAD FLAT WHEEL DETECTORS:United States Patent, 5,133,521 [P].1992-7-28.
[4] Wayside Monitoring Alliance. PRODUCTS [DB/OL]. http://www.waysidealliance.com/product.htm, 2004/2013.
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