Number | Name | Date | Kind |
---|---|---|---|
3187410 | Duinker et al. | Jun 1965 | |
3303292 | Bedell, Jr. et al. | Feb 1967 | |
3354540 | Duinker | Nov 1967 | |
3495325 | Bos et al. | Feb 1970 | |
3597836 | Osaka | Aug 1971 | |
3845550 | Gooch et al. | Nov 1974 | |
3846840 | Childers et al. | Nov 1974 |
Number | Date | Country |
---|---|---|
1,128,646 | Sep 1968 | GBX |
Entry |
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IBM Tech. Disc. Bull., Nystrom et al., Fabrication of Ferrite Recording Heads, vol. 12, No. 7, Nov. 1969, pp. 965-966. |