A simple device for carrying a wide sheet materials are easy to make yourself, having at hand two, tee, four corners and three or four water pipe section.
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Deserved recognition and popularity enjoyed by amateur radio operators is quite simple and reliable circuit includes flip-flop on the two transistors and a pair of thyristors controlled...
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In 1935, in the Reactive section of the CA osoaviahima of the USSR designer A. I. Polar was designed and built experimental rocket. Originally it was called "Osoaviakhim" (R-1)....
