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The German Technical Association of Manufacturers of Standardized Molded and Compression Molded Materials introduced in 1924 an industry standard for Bakelite (https://www.plugsocketmuseum.nl/MPADmarks.html). I would never have discovered that the mark has an M, a P, an A and a D. Great
I can also recommend the book "Kunststoffe" a collectors guide to German World War II plastics and their markings by W.Darrin Weaver.
Made excellent reading. Take a look.
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