supply of breather assy. for transformer type lot 6500/7500 as per abb document no-hstn 422029p001. note: the firms with past performance of the tendered/same items subject to submission of proof of documents such as pos/r note are only eligible.breather assy. for transformer type lot 6500/7500 as per abb document no-hstn 422029p001. note: the firms with past performance of the tendered/same items subject to submission of proof of documents such as pos/r note are only eligible.,breather assy. for transformer type lot 6500/7500 as per abb document no-hstn 422029 p001. note: the firms with past performance of the tendered/same items subject to submission of proof of documents such as pos/r note are only eligible. [ warranty period: 30 months after the date of delivery ] ]