supply of compressed oxygen gas & da gascompressed oxygen gas & da gas,filling of compressed oxygen gas confirming to is:309-2005 (rev, iv) for industrial use in rai lway owned cylinders. full quantity to be supplied upto 01 year period as and when empty cylinders supplie d by railway. freight charges to be borne by firm for empty cylinders ex c&w depot, itwari, nagpur, sec r ailway to firm premises and loaded cylinders to be returned back to same place. [ warranty period: 30 m onths after the date of delivery ] ] , filling of dissolved acetylene gas confirming to is:308-1988 (rev iii) for industrial use in rail way owned cylinders. full quantity to be supplied upto 01 year period as and when empty cylinders supplie d by railway. freight charges to be borne by firm for empty cylinders ex- c&w depot, itwari, nagpur, sec r ailway to firm premises and loaded cylinder back to same place. [ warranty period: 30 months after the date of delivery ] ]