supply of supply of dissolved acetylene gas , supply of dissolved acetylene gas is:308-1962 in firms returnable cylinders.conditions (1) m aterial being required is piecemeal quantities as and when gas cutting works are done. (2) material should be delivered is piecemeal as and when required by consignee in firms returnable cylinder. (3) free delivery of acetylene gas full/load cylinders and take back the empty acetylene gas cylinders by the firm itself inclu ding their own transportation,labours, cylinders, etc. [ warranty period: 30 months after the date of deliv ery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]