| Photocopy of picture from sales literature entitled "Model PS Pocket Filter" from Katadyn U.S.A., Inc., Scottsdale, Ariz., Jun. 1989. |
| Photocopy of picture from sales literature entitled "First Need Portable Water Purification Device" from General Ecology, Inc., of Lionville, Pa., Jun. 1989. |
| Photocopy of picture in article in CanoeSport Journal, Timberline Filter Co., of Boulder, Colo., Fall 1988. |
| Photocopy of picture from sales literature entitled "Pocket Purifier Straw," of Calko, Ltd., Jun. 1989. |
| Photocopy of picture from sales literature entitled "Instant Reusable Water Filtration Device," Calco, Ltd., of Rosemont, Ill., Jun. 1989. |
| Photocopy of picture from sales literature entitled "Outback," of Hiker Supply Co. of Bremerton, Wash., Jun. 1989. |
Patent Grant
D321550
