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| 5583972 | Miller | Dec 1996 | A |
| 5654886 | Zereski et al. | Aug 1997 | A |
| 5751289 | Myers | May 1998 | A |
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| 6188960 | Baron et al. | Feb 2001 | B1 |
| Entry |
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| Dec. 7, 2000 Screen Prints from www.scapeware3d.com, 5 pages. |
| Dec. 7, 2000 Screen Print from www.realpittsburgh.com/partners/wpxi/cameras/towercam.html, 1 page. |