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அரட்டைக்குச் செல்https://www.hoffmann-group.com/IN/en/hin/Measurement-technology/Measuring-tool-sets/Internal-micrometer-sets/Internal-micrometer-set-Holtest-for-measuring-blind-holes/p/429055
https://www.hoffmann-group.com/IN/en/hin/Measurement-technology/Measuring-tool-sets/Internal-micrometer-sets/Internal-micrometer-set-Holtest-for-measuring-blind-holes/p/429055