4. Photography
  5. Having variable focal length of camera objective
  6. Automatic change of focal length

Hisashi Hamada

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Bar code system for brownie film and bar code reader of camera

Registers – Coded record sensors – Particular sensor structure
Patent

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Battery check system

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

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Camera

Photography – With exposure objective focusing means – focusing aid – or... – Dual purpose photoelement
Patent

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Camera and exposure control method

Photography – Exposure data from film itself
Patent

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Camera and focussing method for the same

Photography – With exposure objective focusing means – focusing aid – or...
Patent

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Profile ID: LFUS-PAI-P-200898

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