Portable sonar unit for fishermen

Details Portable sonar unit for fishermen Portable sonar unit for fishermen

1975-06-09

1977-05-24

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Food preparation type

D1004

Patent

active

D02444348

REFERENCES:
patent: D191581 (1961-10-01), Scharfenberg
patent: D222941 (1972-02-01), Knutson
patent: 3747413 (1973-07-01), Barrett
Electronics World -- June 1960 -- p. 30 -- Depth Meters at right.
Radio-Electronics -- July 1960 -- p. 29 -- "FM Transmitter" at left.

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