Number | Name | Date | Kind |
---|---|---|---|
2150227 | Lake et al. | Mar 1939 | |
2972402 | Howard | Feb 1961 | |
3367471 | Berill | Feb 1968 | |
3384211 | Placke et al. | May 1968 | |
4247210 | Kacmarcik et al. | Jan 1981 | |
4329072 | Kacmarcik | May 1982 | |
4347007 | Schaefer | Aug 1982 |
Number | Date | Country |
---|---|---|
708691 | Jul 1941 | DE2 |
1436757 | Sep 1973 | DEX |
Entry |
---|
Schaefer, "Two-Color Cartridge Ribbon System with Correction", vol. 22, No. 6, 11/79, IBM. |