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[QUOTE]Originally posted by Rick A: [QB] Mullens Paper Tester Ever wonder how the strength of paper or textile material is figured? In 1877 B.F. Perkins invented the Mullens Paper Tester. The gauge,(many of which were produced by Ashton Valve) would read the pressure at which the paper burst. These machines are still produced today. https://books.google.com/books?id=JL...page&q&f=false https://books.google.com/books?id=4B...page&q&f=false https://www.mullentesters.com/testers.html https://www.smokstak.com/forum/threads/ashton-valve-company.187142/page-2#lg=post-1602438&slide=0 https://www.smokstak.com/forum/threads/ashton-valve-company.187142/page-2#lg=post-1602438&slide=1 https://www.smokstak.com/forum/threads/ashton-valve-company.187142/page-2#lg=post-1602438&slide=2 [/QB][/QUOTE]
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