supply of supply and installation (including necessary alteration / cutting/ welding of coach body window frame required to be done for the installation) of emergency openable window arrangement with sealed window unit for icf first ac coaches as per icf drawing no. icf/sk-5-4-276, alt -f or latest, item no 1 to 19. asupply and installation (including necessary alteration / cutting/ welding of coach body window frame required to be done for the installation) of emergency openable window arrangement with sealed window unit for icf first ac coaches as per icf drawing no. icf/sk-5-4-276, alt -f or latest, item no 1 to 19. a,supply and installation (including necessary alteration / cutting/ welding of coach body win dow frame required to be done for the installation) of emergency openable window arrangement with se aled window unit for icf first ac coaches as per icf drawing no. icf/sk-5-4-276, alt -f or latest, item no 1 to 19. and for item no. 20 as per drawing no. icf/sk-5-4-225 col- ii, item no -2, 5,10 to 15 only. window frame assem bly for emergency window as per icf drg no icf/sk-5-4-278, alt -nil or latest with holding frame for emerge ncy window as per icf drg no icf/sk-5-4-281, alt d or latest with item no.-2. note- a prototype of window ins tallation is to be approved by consignee before supply. [ warranty period: 30 months after the date of delivery ] ]