mast operating lever
/ˈmast ˈɒpəɹˌeɪtɪŋ ˈliːvə/
n
English · mast operating lever中文 · 升降操纵杆Español · palanca de maniobraFrançais · levier de manœuvre du mât
意味：Lever controlled by the operator to move the carriage along the masts.