ES37907A2 - Un procedimiento especial para producir el pavonado u oxidación del hierro y del acero, dándoles en ocho horas un color gris-oscuro brillante.
- Google Patents
Un procedimiento especial para producir el pavonado u oxidación del hierro y del acero, dándoles en ocho horas un color gris-oscuro brillante.
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ES37907A1906-03-101906-03-10Un procedimiento especial para producir el pavonado u oxidación del hierro y del acero, dándoles en ocho horas un color gris-oscuro brillante.
ExpiredES37907A2
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