4. Dynamic magnetic information storage or retrieval
  5. Head
  6. Erase

Keizo Ishiwatari

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Composite diaphragm for speaker

Stock material or miscellaneous articles – All metal or with adjacent metals – Foil or filament smaller than 6 mils
Patent

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Magnetic erasing head

Dynamic magnetic information storage or retrieval – Head – Erase
Patent

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Method for manufacturing magnetic head using boronizing treatmen

Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent

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Method of making metal coated foil speaker diaphragm

Acoustics – Diaphragm – Critically defined material or coating
Patent

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Profile ID: LFUS-PAI-P-979307

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