Number | Date | Country | Kind |
---|---|---|---|
56-79828 | May 1981 | JPX | |
56-129066 | Aug 1981 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
4149207 | Porter | Apr 1979 | |
4175274 | Mahn | Nov 1979 |
Number | Date | Country |
---|---|---|
2545091 | Aug 1976 | DEX |
Entry |
---|
IBM T/D; vol. 19, No. 12, 5-1977; "Encased Flexible Magnetic Disk with Wiper", M. Bothun. |