While still in school, I restored the spent battery pocket receiver rather primitive, but effective way. With pliers gently removed the graphite rod and filled the battery with water. Then waited until the water completely evaporated, put back stem — and battery-some time worked better than new.
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Materialiter Mr-3-4 (motor cultivator, 3-I model, 4-rotor) is a result of long searches conducted by young inventors. The final version consists of engine, from chainsaws "Friendship"...
