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JB/T 4394-1999 Chemical analysis method for total rare earth content, silicon and magnesium in rare earth magnesium alloys

JB/T 4394-1999 This standard is a revision of JB 4394-87 "Chemical Analysis Methods for Total Rare Earth, Silicon and Magnesium in

1970-01-01 category：Machinery Industry Standard (JB)
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JB/T 4393-1999 Polyvinyl alcohol synthetic quenching agent

JB/T 4393-1999 This standard is a revision of JB 4393-87 "Technical Conditions for Polyvinyl Alcohol Synthetic Quenching Agent". D

1970-01-01 category：Machinery Industry Standard (JB)
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JB/T 4392-1999 Method for determination of properties of water-soluble quenching medium for organic matter

JB/T 4392-1999 JB/T 4392-1999 Method for determination of properties of water-soluble quenching medium for organic matter JB/T4392

1970-01-01 category：Machinery Industry Standard (JB)
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JB/T 4390-1999 High and medium temperature heat treatment salt bath calibrator

JB/T 4390-1999 This standard is a revision of JB 4390-87 "High and medium temperature heat treatment salt bath calibrator". Compar

1970-01-01 category：Machinery Industry Standard (JB)
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JB/T 4385.2-1999 Complexity classification and conversion coefficient of hammer free forgings

JB/T 4385.2-1999 This standard is a revision of JB 4386-87 "Complexity Classification and Conversion Factor of Hammer Free Forging

1970-01-01 category：Machinery Industry Standard (JB)
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JB/T 4385.1-1999 General technical conditions for hammer free forgings

JB/T 4385.1-1999 This standard is a revision of JB 4385-87 "General Technical Conditions for Hammer Free Forgings". There are slig

1970-01-01 category：Machinery Industry Standard (JB)
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JB/T 4381-1999 Limit deviation of stamping and shear blanking dimensions without tolerances

JB/T 4381-1999 This standard is not equivalent to JIS B O410-1978 "General tolerances for metal plate shearing processing". This s

1970-01-01 category：Machinery Industry Standard (JB)
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JB/T 4378.1-1999 Structural elements of metal cold stamping parts

JB/T 4378.1-1999 This standard is a revision of JB 4378-87 "Structural Elements of Metal Cold Stamping Parts". There are slight ad

1970-01-01 category：Machinery Industry Standard (JB)
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