| Number | Name | Date | Kind |
|---|---|---|---|
| 827575 | Smead | Jul 1906 | A |
| 1600794 | Brown | Sep 1926 | A |
| 4999887 | Kraus | Mar 1991 | A |
| 5217191 | Smith | Jun 1993 | A |
| 5685508 | Smith | Nov 1997 | A |
| 5816554 | McCracken | Oct 1998 | A |
| 5829718 | Smith | Nov 1998 | A |
| 5833206 | Peacock | Nov 1998 | A |
| 6017005 | Smith | Jan 2000 | A |
| D427049 | Neider et al. | Jun 2000 | S |
| D427053 | Nelson | Jun 2000 | S |
| D435430 | Valentz et al. | Dec 2000 | S |
| Entry |
|---|
| Portable Pipe Hangers, Inc., Specifications For Standard Models, “Rooftop Walkway Systems”, BK 3002, BK 3003, BK 3013, BK 3025. |