4. Fire escape, ladder, or scaffold
  5. Scaffold external of shaft

William E. Butler

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Bunsen burner guard

Combustion – Mixer and flame holder – Bunsen burner type
Patent

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Foldable hunting stool

Fire escape – ladder – or scaffold – Scaffold external of shaft
Patent

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Picture frame molding

Design Patent

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System for determining target positions in the body observed in

X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent

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System for determining target positions in the body observed...

X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Reexamination Certificate

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