| Number | Date | Country | Kind |
|---|---|---|---|
| 63-2206 | Jan 1988 | JPX |
| Number | Name | Date | Kind |
|---|---|---|---|
| D262923 | Broilliard | Feb 1982 | |
| D273134 | Pagels | Mar 1984 | |
| D280913 | Nibley | Oct 1985 | |
| D303958 | Cranston et al. | Oct 1989 | |
| D304178 | Cranston et al. | Oct 1989 |
| Entry |
|---|
| IBM Technical Disclosure Bulletin; Feb. 73. |