PATENTS

US:

5,989,683,  6,663,809,  6,372,068,   6,673,413,  7,011,879

US:

5,943,804

Canada:

2,199,227,  2,216,069,  2,214,068

Mexico:

204,243,  230,263,  200,979

Israel:

121,593

US:

5,878,520