Inventor
JEFFERS ROBERT K
US6 patents
Patents
6 patentsUS4555938ADec 3, 1985
Marine instrument
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US5610876AMar 11, 1997
Acoustic deterrent system and method
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US4644787AFeb 24, 1987
Marine instrument
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US5606253AFeb 25, 1997
Guided flow marine speedometer including angularly shaped housing for guiding water to a paddlewheel sensor at that angle
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Masthead control system
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Automatic switch for marine sounders
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