4. Card, picture, or sign exhibiting
  5. Changing exhibitor
  6. With sound

Ren G. Yang

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Namecard holder

Card – picture – or sign exhibiting – Changing exhibitor – With sound
Patent

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Unattended card exchange unit

Check-actuated control mechanisms – Control mechanism actuated by check – other than coin – which... – Having electric circuit with switch operated by check
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Profile ID: LFUS-PAI-P-577502

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