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一九七九年,朱利安B·库恩等人(Julian B.Coon at al)制成了一种用来测定地面运动速度的激光检波器。这项发明已于一九八一年八月十八日获得美国专利(专利号4284350)。
In 1979, Julian B. Coon at al made a laser detector to measure the speed of ground motion. This invention was granted a U.S. patent on August 18, 1981 (Patent No. 4284350).