Home / Standards / GB/T 2491-2003 GB/T 2491-2003 Bonded abrasive products — Method for testing hardness with Rockwell hardness tester 普通磨具 洛氏硬度计检验硬度的方法 Standard Type GBT ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A