September 1, 2009

A combination of components for the dynamic measurement of the grade of terrain, including a rocker arm disposed horizontally across a reference structure, a first displacement transducer positioned at the first end of the rocker arm and a second displacement transducer positioned at the second end of the rocker arm. An absolute angle measurement device is positioned on the reference structure to provide the angle of the rocker arm relative to earth horizontal.

20

September 1, 2009

11/740,142

April 25, 2007

33/521   33/365 33/534 701/1 73/146

E01C   23/01   (20060101)  

33/521   33/523   33/523.1   33/523.2   33/365   33/366.11   33/366.13   33/366.14   33/366.23   33/24   33/25   33/26   33/27   33/28   33/29   33/30   33/31   33/32   33/33   33/34   33/35   33/36   33/37   33/38   33/39   33/40   33/41   33/42   33/43.27   33/1H   33/1N   33/1Q   33/1PT   33/23   33/24   33/25   33/26   33/27   33/28   33/29   33/30   33/31   33/32   33/33   33/34   33/35   33/36   33/37   33/38   33/39   33/40   33/41   33/42   33/43   33/337   33/338   33/343   33/264   33/287   33/288   33/533   33/534   33/600   33/624   180/282   73/146   73/104   73/105   701/1   701/207   701/223