PL272224A1 - The system for generating of electric signal which determines the transition moment of the alternating voltage by means of zero value
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The system for generating of electric signal which determines the transition moment of the alternating voltage by means of zero value
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PL27222488A1988-05-021988-05-02The system for generating of electric signal which determines the transition moment of the alternating voltage by means of zero value
PL272224A1
(en)