For the door keys there are all kinds of ring and other key chains that bind them in one bundle. And what spanners worse? If they (unilateral construction) have a lot of drill holes on the handles and push the wire or rope to keep and use them will be more convenient.
V. GOLOVASHIN, fish
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Electronic metronome
"beats" the beats not only sound, but light pulses. In his scheme includes two transistor of different conductivity. The excitation amplifier is implemented by using positive feedback...
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