supply of envelop , window envelop size 10 x 23 cms having window size 10 x 4 cms printing o.i.g .s. on the top and patiala locomotive works patiala bottom left in bilingual i.e. hindi & e nglish. gsm of paper should be 70 (plus/minus 3 gsm). [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ] , printing and supply of envelop size:-280 mm x 120 mm of 70 gsm (plus/minus 3 gsm) (cloth binded yellow colour) printed o.i.g.s on top and patiala locomotive works, patiala at bottom left bilingual i.e in hindi and english. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]