two-year rate contract for the job of eot crane maintenance and load testing in various plant in rcf thal , service as per following description , charges for supervisor , charges for mechanical fitter , charges for electrician , charges for rigger , charges for welder , mobilization & demobilization charges ( in rs . for to & fro trip ) , witnessing & issue of load test certificate for cranes up to 5 ton , including jib crane , witnessing & issue of load test certificate for cranes above 5 ton to 35 ton , witnessing & issue of load test certificate for 100 ton crane , witnessing & issue of load test certificate for 250 ton lifting device