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A. W. & J. E. Walker Extension Step - Ladders - DPLA - 02562da0f8a91b11b7052c00fef9043c (page 1)

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technical diagrams patent drawings high resolution
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Date

18/03/1873
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http://commons.wikimedia.org/
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label_outline Explore Patent Drawings, Technical Diagrams

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technical diagrams patent drawings high resolution