13Audio

Oxygen free copper? PROCESS OF REFINING COPPER patent from 1934….!

Next time we read the voodoo marketing kind from the snake oil merchants think of this post and this patent

See it here https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US1948316.pdf

Screen Shot 2013-12-23 at 8.36.54 AM

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