4. Optical: systems and elements
  5. Lens
  6. Combined with diverse art tool, instrument or machine

Allen Tsai

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Combined screwdriver and magnifying glass

Optical: systems and elements – Lens – Combined with diverse art tool – instrument or machine
Patent

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Screw fastener assembly

Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1217052

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