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types of screw heads No Further a Mystery

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To paraphrase, 3 Robertson squares are superimposed in a successive 30° rotation. The design is comparable to that of your double-sq., in both conditions The concept staying that it resembles a square (Robertson) but https://lewisntae471312.blogdanica.com/28061539/the-smart-trick-of-types-of-screw-heads-that-no-one-is-discussing

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