Baterías de acumuladores para locomotoras de mina con grisú. Medida de la resistencia de aislamiento de la batería.
BATTERIES FOR MINING LOCOMOTIVES FOR MINES SUSCEPTIBLE TO FIREDAMP. MEASUREMENT OF THE BATTERY INSULATING RESISTENCE.
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29.220.20 / Acid secondary cells and batteries
29.260.20 / Electrical apparatus for explosive atmospheres
73.100.40 / Haulage and hoisting equipment
CTN 22/SC 1 - Mineral raw materials
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