PATENTS:<br>
<br>
E. L. Hall and M. Ehtashami, "Omnidirectional Vision System for Mobile <br>
Robots," U.S. Patent No. 4,670,648, 1987.<br>
<br>
S. A. Burke, Z. L. Cao, and E. L. Hall, "Guiding an Unmanned Vehicle by<br>
Reference to Overhead Features," US Patent Number 5,155,684, Oct. 13, 
1992.<br>
<br>
A. K. Mazouz, G. D. Slutzky, E. L. Hall, R. L. Huston, and R. L. Shell,<br>
"Method and Apparatus for Palletizing Randomly Arriving Mixed Size and <br>
Content Parcels," U.S. Patent No. 5,175,692, Dec. 29, 1992.<br>