abstract a lift truck having a frame and a two stage telescopic mast in which an outer movable mast is mounted to telescope over an inner mast which is fixed to the frame each mast having a substantially continuous unitary tubular body which provides superior strength characteristics in response to torsional loads and bending moments the masts each include vertically extending beams integral with the tubular bodies thereof having tracks to receive rollers mounted to the beams so that the only contact between the masts is by the rollers the beams of the outer mast include tracks which receive the rollers of a platform having a lifting fork structure and which is vertically movable relative to the outer mast application_number US 48762583 A description as shown in fig1 and 2 the lift truck of the present invention generally designated 10 consists of a frame 12 primary mast 14 and a main carriage 15 which includes platform means 16 the frame 12 includes a rearwardly mounted power unit 18 and a forwardly extending load wheel frame 20 having load wheels 22 attached thereto the load wheel frame includes outriggers 23 spaced apart a distance which is determined by the requirements of the particular application of the truck the main carriage 15 includes a side shift carriage 24 mounted forwardly of the platform 16 and capable of side to side movement relative to the platform an auxiliary mast 26 is mounted to the side shift carriage 24 and is capable of transverse movement relative.