ES29412A3 -
A special procedure to produce the blueing or oxidation of iron and steel, giving them a brilliant dark gray color in eight hours.
- Google Patents
A special procedure to produce the blueing or oxidation of iron and steel, giving them a brilliant dark gray color in eight hours.
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Individual
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Individual
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ES29412A1902-03-061902-03-06
A special procedure to produce the blueing or oxidation of iron and steel, giving them a brilliant dark gray color in eight hours.
ExpiredES29412A3
(en)