4. Card, picture, or sign exhibiting
  5. Changing exhibitor
  6. Rotatable carrier for display item

David A. Lawson

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Energy conversion apparatus

Prime-mover dynamo plants – Fluid-current motors
Patent

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Helical scan tape track following

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate

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Intermeshed and interleaved dynamic display units

Card – picture – or sign exhibiting – Changing exhibitor – Rotatable carrier for display item
Patent

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Profile ID: LFUS-PAI-P-202040

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