Number | Name | Date | Kind |
---|---|---|---|
3635174 | Ball et al. | Jan 1972 | |
3922045 | Meyer | Nov 1975 | |
4094256 | Holper et al. | Jun 1978 | |
4094561 | Wolff et al. | Jun 1978 | |
4163867 | Breidenbach | Aug 1979 | |
4296981 | Hildebrandt et al. | Oct 1981 | |
4323291 | Ball | Apr 1982 | |
4535703 | Henriott et al. | Aug 1985 | |
4792881 | Wilson et al. | Dec 1988 | |
4827850 | Diffrient | May 1989 | |
5103741 | Grund et al. | Apr 1992 | |
5121698 | Kelley | Jun 1992 | |
5226705 | Rorke et al. | Jul 1993 | |
5231562 | Pierce et al. | Jul 1993 | |
5272988 | Kelley et al. | Dec 1993 | |
5337657 | Diffrient | Aug 1994 | |
5357874 | Palmer | Oct 1994 | |
5451101 | Ellison et al. | Sep 1995 | |
5606920 | Meyer et al. | Mar 1997 | |
5640912 | Diffrient | Jun 1997 | |
5715761 | Frattini | Feb 1998 | |
5934201 | Diffrient | Aug 1999 | |
5971509 | Deimen et al. | Oct 1999 | |
5998732 | Caveney et al. | Dec 1999 | |
6029587 | Rozier, Jr. et al. | Feb 2000 |
Number | Date | Country |
---|---|---|
2020145 | Dec 1971 | DE |
3337062 | May 1985 | DE |
0010277 | Apr 1980 | EP |
0307567 | Mar 1989 | EP |
2406403 | Jun 1979 | FR |
841466 | Jul 1960 | GB |
Entry |
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Bretford Presentation Environments “PowerTrak and Power House”product brochure, Bretford Manufacturing Company, 7/97, 2 pages. |