4. Fire escape, ladder, or scaffold
  5. Means maintaining step lever on horizontally pivoted ladder

John E. Mason

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Adjustable stairway having retractable wheel carriage

Fire escape – ladder – or scaffold – Means maintaining step lever on horizontally pivoted ladder
Patent

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Fabrication of permanent magnets without loss in magnetic proper

Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
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Profile ID: LFUS-PAI-P-1565396

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