US Patent 6997638 Anti-terrorist road block
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Patent abstract
A road block having an extensible bollard that is manually or electronically actuated by a powerful spring force for slow extension, and by both the spring and a power lift for rapid extension.
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Patent Inventor Names
Clifford J. Hensley0
David L. Stice0
Robert C. Herrin0
Robert L. Sims0
Date of Patent
February 14, 2006
0Patent Application Number
106357240
Date Filed
August 5, 2003
0Patent Primary Examiner
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US Patent 6997638 Anti-terrorist road block
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