| Number | Name | Date | Kind |
|---|---|---|---|
| 3340822 | Delasalle | Sep 1967 | |
| 3418944 | Hansford et al. | Dec 1968 | |
| 3474738 | Di Rosa | Apr 1967 | |
| 3769915 | Swartz | Nov 1973 | |
| 4089270 | Blake | May 1978 | |
| 4229857 | Toder | Oct 1980 | |
| 4336757 | Toder | Jun 1982 | |
| 4555828 | Matimura | Dec 1985 | |
| 4642947 | Dickson | Feb 1987 | |
| 4880046 | Gesy | Nov 1989 | |
| 4924776 | Uttscheid | May 1990 | |
| 5016318 | Harris | May 1991 | |
| 5033394 | Summa | Jul 1991 |
| Number | Date | Country |
|---|---|---|
| 477599 | Oct 1969 | CHX |
| 1465372 | Mar 1989 | SUX |
| Entry |
|---|
| Modernfold, Inc., Operable Walls, Portable Panels, Accordion Partitions (product brochure), 1991, (see p. 27 for track switches). |