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Patent: 3M - Minnesota Mining and Manufacturing Company (DIG) - Read it all the way to the AC. (patft.uspto.gov)
posted ago by BrewSkiMAGA ago by BrewSkiMAGA +19 / -0
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– BrewSkiMAGA [S] 1 point ago +1 / -0

https://patents.google.com/patent/US4501923A/en

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