supply of supply installation, testing and commissioning of 12 m double mast aerial maintenance ladder with telescopic lifting mechanism with lifting capacity of 150-200kgs equivalent to jn ladder model no (in115/a) , supply installation, testing and commissioning of 12 m double mast aerial maintenance ladder with telesc opic lifting mechanism with lifting capacity of 150-200kgs equivalent to jn ladder model no (in115/a) ] , supply, testing and commissioning of 12 m double mast aerial maintenance aluminium telescopic ladder hydraulic lifting mechanism driven by motor with lifting capacity of 150-200kgs, operating with single phase 230v pow er source with inbuilt 0.75hp motor,maximum reach height -12mtrs working platform made up of mild steel as per is 20 62, plat form of size 1400x600mm, overload protection and safety railing to platform, equivalent to alco aluminium l adders model no (al-029) makes: alco, jn ladder or similar makes. ]