supply of filling of compressed oxygen gas & dissolved acetylene gasfilling of compressed oxygen gas & dissolved acetylene gas,filling of compressed oxygen gas confirming to is:309-2005 (rev, iv) for industrial use in railway owned cylinders. full quantity to be supplied upto 01 year period as and when empty cylinders supplied by railw ay. freight charges to be borne by firm for empty cylinders ex c&w depot, itwari, nagpur, sec railway to firm premises and loaded cylinders to be returned back to same place. [ warranty period: 30 months after the date of delivery ] , filling of dissolved acetylene gas confirming to is:308-1988 (rev iii) for industrial use in railway o wned cylinders. full quantity to be supplied upto 01 year period as and when empty cylinders supplied by railwa y. freight charges to be borne by firm for empty cylinders ex- c&w depot, itwari, nagpur, sec railway to firm p remises and loaded cylinder back to same place. [ warranty period: 30 months after the date of delivery ]