??????????????????? (Pre Bore) ????????????????????????????????????????????????????????????? ?????????????????????????????????????????????????????? ????????????????????? (Pre Bored) ???????????????????????????????????????????? ????????????? ???????????????????????????????? ???????????????????????????????????????????
เนรมิตเครนให้เหมือนใหม่ได้ด้วยการโอเวอร์ฮอลเครน
????????????????? ?????????????????? ????????????????? (Overhaul) ??????????????? ????????????????????????????????????? ?????????????????????????????????? ??????????????????????????????????????????????? ??????????? ?????????????????????????????????????????????????? ????????????????????????????????????????? ????????????????????????????????