4. Measuring and testing
  5. Navigation
  6. Ship's log

Ryoji Sawada

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Battery voltage warning device

Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent

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Fluid level indicator for small watercraft

Measuring and testing – Liquid level or depth gauge – Float
Patent

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Indicator for small watercraft

Communications: electrical – Watercraft alarm or indicating systems
Patent

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Running speed detecting device for marine vessels

Boots – shoes – and leggings
Patent

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Running speed detecting device for marine vessels

Measuring and testing – Navigation – Ship's log
Patent

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Profile ID: LFUS-PAI-P-835556

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