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Equipo de trituracicbn montado sobre. Equipo de respiración autónomo G1 de MSA. · 1936 Primer equipo de respiración para combate de incendios el equipo de respiración con oxígeno para media hora liviano de MSA. 1954 Máscara de aire a demanda para aire u oxígeno aprobada por la Agencia Estatal de Minería. 1967 MSA introduce el equipo de …
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