| Number | Date | Country | Kind |
|---|---|---|---|
| 23023/86[U] | Sep 1986 | ITX |
| Number | Name | Date | Kind |
|---|---|---|---|
| D107076 | Erickson | Nov 1937 | |
| D220703 | Deguchi et al. | May 1971 |
| Entry |
|---|
| Office Products Dealer, Jun. 1985, p. 57, item mid-way on left side of page. |
| The Architectural Forum, May, 1947, p. 124, item bottom right side of page. |