4. Electric lamp and discharge devices
  5. With luminescent solid or liquid material
  6. Vacuum-type tube

Tadashi Iwasa

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Double-faced vacuum fluorescent display

Electric lamp and discharge devices – With luminescent solid or liquid material – Vacuum-type tube
Patent

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Variable density image processing apparatus

Photocopying – Projection printing and copying cameras – With developing
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Profile ID: LFUS-PAI-P-1666558

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