It is convenient to create a temporary memo — whether it is preparing the card for your file, or just notes about the latest Affairs in the coming days, or envelopes with letters awaiting answer: they are placed between the turns of the springs (preferably of large diameter). Ensure that the spring does not ride, attach the ends of tin or cardboard cheeks.
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RIVET FRICTION
Perhaps one of the most ancient and at the same time, and still most common methods of connecting parts of machinery, parts, tools — mount rivets. Is riveting, as a rule, the percussion...
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