Number | Date | Country | Kind |
---|---|---|---|
3742147 | Dec 1987 | DEX | |
3742528 | Dec 1987 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
4486863 | French | Dec 1984 | |
4894807 | Alam et al. | Jan 1990 |
Entry |
---|
"Prakla--Seismos Information No. 43", Streamer Position for 3--D Surveys, pp. 1-12, Publ. Aug., 1983. |
Dr. Helmut Weichart, "Forschunsgschiff Prospekta-vollgepackt mit Elekftonik", published in Funkschau, Apr. 1971. |
"Prakls--Seismos Information No. 46", Streamer Positioning and Coverage Control, 1984, pp. 1-20. |