Figures from US644244

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Figures from US644244

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Summary

Sketch of Ferrata's Piano Attachment Invention from US Patent 644244. The patent was granted in 1900. This photo was extracted from: File:US644244.pdf

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patent drawings
united states
giuseppe ferrata composer
piano diagrams
united states patent drawings
uspto
technical drawing
patent application
date_range

Date

1900
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Source

This photo shows the figures from the United States Patent which is already on Wikimedia Commons as: File:US644244.pdf
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Link

http://commons.wikimedia.org/
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Copyright info

Public Domain

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patent drawings
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giuseppe ferrata composer
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united states patent drawings
united states patent drawings
uspto
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technical drawing
technical drawing
patent application
patent application