
On the door of the wardrobe is usually a wire bracket-hanger for small things: scarves, ties, belts, trying to slip off, fall off when opened. This will not happen if they were to consolidate the conventional clothespins — simple, convenient, safe.
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The device, whose scheme is published in the journal "Popular electronics" (USA), produces a positive pulse when a sound (for example, firing of the gun) reaches the microphone B1 (see...
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