4. Dynamic magnetic information storage or retrieval
  5. General processing of a digital signal
  6. Data clocking

Allen P. Hartman

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Method and apparatus for writing spiral servo information by...

Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
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Methods and apparatuses for writing spiral servo patterns...

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