Number | Date | Country | Kind |
---|---|---|---|
3130844 | Aug 1981 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3242208 | Martin | Mar 1966 | |
3576872 | Singhal | Apr 1971 |
Number | Date | Country |
---|---|---|
1117494 | Jun 1968 | GBX |
1260881 | Jan 1972 | GBX |
Entry |
---|
Abstract Netherlands, No. 7,105,350, 10/24/72. |
Abstract Japanese, No. 73 16 502, 5/22/73. |