4. Telephonic communications
  5. With check operated control
  6. Other than coin

Daniel A. Hanson

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Disk drive implementing wear prevention in a high frequency...

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

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Prepay telecommunications system

Telecommunications – Radiotelephone system – Usage measurement
Patent

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Prepay telecommunications system

Telecommunications – Radiotelephone system – Usage measurement
Reexamination Certificate

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Prepay telecommunications system

Telecommunications – Radiotelephone system – Usage measurement
Reexamination Certificate

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Prepay telecommunications system

Telecommunications – Radiotelephone system – Usage measurement
Reexamination Certificate

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