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G. Smith Duplex-Telegraph - DPLA - 0f99e9e9253f23c2a7be472ee2076d30 (page 1)

description

Summary

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Tags

technical diagrams patent drawings high resolution
date_range

Date

06/07/1875
link

Link

http://commons.wikimedia.org/
copyright

Copyright info

Public Domain

label_outline Explore Patent Drawings, Technical Diagrams

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technical diagrams patent drawings high resolution