SU675395A1 - Device for measuring operation time of switching-off apparatus with unit for protection from earth current leakage in mine network
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Device for measuring operation time of switching-off apparatus with unit for protection from earth current leakage in mine network
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SU762432795A1976-12-221976-12-22Device for measuring operation time of switching-off apparatus with unit for protection from earth current leakage in mine network
SU675395A1
(en)