ARTICLE
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MAGNETIC BUTTON
Short age pushpin! Careless movement or too rigid Board and the button breaks or bends. There are many various designs of holders for posters and maps — from the simplest (e.g., dozens...
INSTEAD OF THE VALVE BALL
Have water pipes in homes, as in the system of cold and hot water, a so-called shut — off valves- the valves closing off the flow of water in taps. The design of such valves may be...
