Number | Name | Date | Kind |
---|---|---|---|
D191581 | Scharfenberg et al. | Oct 1961 | |
D198913 | Smith | Aug 1964 | |
D233152 | Knutson | Oct 1974 | |
3588795 | Linardos et al. | Jun 1971 | |
4413518 | Jones | Nov 1983 |
Entry |
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Practical Electronics, 5/81, p. 48, Digisounder. |
Powerboat & Fishing Instruments Buyers Guide, 1982, pp. 43-53, Depth Sounders. |