| Number | Name | Date | Kind |
|---|---|---|---|
| 444979 | Harrison et al. | Jan 1891 | |
| 3304103 | Bensler et al. | Dec 1965 | |
| 3419286 | Noonan et al. | Dec 1968 | |
| 3507519 | McNabb | Apr 1970 | |
| 3655121 | Ward | Apr 1972 | |
| 3726471 | Kalb | Apr 1973 | |
| 3987960 | Gardiner | Oct 1976 | |
| 3993299 | O'Brien et al. | Nov 1976 | |
| 4029341 | Neill et al. | Jun 1977 | |
| 4211434 | Reese | Jul 1980 | |
| 4213639 | Absler et al. | Jul 1980 | |
| 4230262 | Denay et al. | Oct 1980 | |
| 4236731 | Hektoen | Dec 1980 | |
| 4277089 | Lockhart | Jul 1981 | |
| 4346916 | Shelton | Aug 1982 | |
| 4418865 | Bowen | Dec 1983 | |
| 4429827 | Murray | Feb 1984 | |
| 4493496 | Kaluza | Jan 1985 | |
| 4598935 | Stewart | Jul 1986 | |
| 4614361 | Foster | Sep 1986 | |
| 4682793 | Walz | Jun 1987 | |
| 4928874 | Henry et al. | May 1990 | |
| 4995642 | Juszak et al. | Feb 1991 | |
| 5020830 | Shishido | Jun 1991 | |
| 5071167 | O'Brien | Dec 1991 |
| Number | Date | Country |
|---|---|---|
| 2252792 | Jun 1975 | FRX |
| Entry |
|---|
| IBM Technical Disclosure Bulletin of Eichorn, vol. 5, No. 4, Sep. 1962. |