00538nam a2200169Ia 4500003000900000008004100009040001600050080002600066110003300092245010600125260005000231300000800281500001900289650001800308650002100326650002100347IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a083.7:621.762.84bISI  aIndian Standards Institution 0aIndian standard dimensions for `o' rings and grooves for vacuum flangescIndian Standards Institution  aNew DelhibIndian Standards Institutionc1973  a7p.  aIS 6838 : 1973  a Standards   a Vacuum Flanges  aNASA Thesaurus