Tender For supply of service job of accommodation ladder for p 17 a yd 3022 to 24 : : - service of side cylinder and valve of door locking for accommodation ladder closuer for p17a yd 3022 , service of side cylinder and valve of door locking for accommodation ladder closuer for p17a yd 3023 , service of side cylinder and valve of door locking for accommodation ladder closuer for p17a yd 3024 , document , certificate