4. Electric lamp and discharge devices
  5. Cathode ray tube
  6. Shadow mask, support or shield

Klaus-Peter Helmetag

Inventor

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Composite shadow mask

Radiation imagery chemistry: process – composition – or product th – Producing cathode-ray tube or element thereof
Patent

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Composite shiftable aperture mask

Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent

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Metal components for picture tubes

Metal treatment – Stock – Ferrous
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1328916

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