4. Dynamic information storage or retrieval
  5. Duplication or copying

David E. Birt

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Disc records having surface markings

Dynamic information storage or retrieval – Duplication or copying
Patent

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Foil video discs

Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent

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Moulding video discs

Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Surface deformation means only
Patent

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Record matrix preparation

Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent

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Profile ID: LFUS-PAI-P-352603

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