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John Herschel created the blueprint process in 1842.

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John Herschel created the blueprint process in 1842..jpg

WGC Vol. 7 No.5 September 2002.

GLOB MILLS BLUEPRINT, CIRCA 1899.

Posted on: Sunday 3 March 2019
Albums: A FEW SCHEMATIC MECHANICAL DRAWINGS FROM THE GOOD OLD DAYS OF HARD WORK.
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