supply of log books of 3-phase locos, 1/4 th demi b/s bks, printing in black ink on 60 gsm maplitho 206 white papers and along with yellow colour printing cover of 130gsm. note: one sample should be got approved before effecting bulk supply.log books of 3-phase locos, 1/4 th demi b/s bks, printing in black ink on 60 gsm maplitho 206 white papers and along with yellow colour printing cover of 130gsm. note: one sample should be got approved before effecting bulk supply.,log books of 3-phase locos, 1/4 th demi b/s bks, printing in black ink on 60 gsm maplitho 20 6 white papers and along with yellow colour printing cover of 130gsm. note: one sample should be got app roved before effecting bulk supply. [ warranty period: 30 months after the date of delivery ] ]