Number | Name | Date | Kind |
---|---|---|---|
3922464 | Silver et al. | Nov 1975 | |
4012364 | Farber | Mar 1977 |
Number | Date | Country |
---|---|---|
2189489 | Jan 1974 | FRX |
2292382 | Dec 1990 | JPX |
Entry |
---|
World Patents Index Latest, Week 9103, Derwent Publications Ltd. AN 91-019251, London, GB of JP-A-2-292382 published Dec. 3, 1990. |