Cylindrical helical compression (tension) springs of I class and of 1 category made of round steel. Main parameters of coils
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Cylindrical helical compression (tension) springs of II class and of 1 category made of round steel. Main parameters of coils
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Digital instruments and measuring transducers of voltage, current and resistance. General technical requirements and methods of tests
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Systems ground-control monitoring of boring process oil and gasdrill-holes. General technical requirements and test methods
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