Number | Date | Country | Kind |
---|---|---|---|
8200355 | Feb 1982 | NLX |
Number | Name | Date | Kind |
---|---|---|---|
3617719 | May | Jun 1972 | |
3669447 | Turner et al. | Jun 1972 | |
3929327 | Olson | Dec 1975 | |
4359219 | Garayuso | Nov 1982 |
Number | Date | Country |
---|---|---|
1377846 | Dec 1974 | GBX |
Entry |
---|
Xerox Disclosure Journal, vol. 4, No. 3, May/Jun. 1979, Hawkins et al., p. 327. |