May 26, 2009

The level with a generally u-shaped or round, rigid frame. The outer surface is comprised of a number of planar reference faces that are at different fixed angles to a spirit vial mounted in the frame. Optionally, magnets are embedded in the reference faces. Optionally, there are grooves in the reference faces.

7

May 26, 2009

11/755,150

May 30, 2007

33/379   33/451

G01C   9/24   (20060101)  

33/365   33/379   33/381   33/382   33/383   33/384   33/385   33/347   33/343   33/381   33/382   33/383   33/384   33/385   33/451   33/481   33/529   33/412   33/492