As the boom position detecting means there may be used a detector which detects {HEAD ~ the angle} of {TAIL ~ the boom} 3, but in this embodiment there is used a stroke meter 71 which detects the length of the cylinder 50 shown in FIG 7 and which is attached to the cylinder 50 
of
As the boom position detecting means there may be used a detector which detects { HEAD ~ the angle } of { TAIL ~ the boom } 3 , but in this embodiment there is used a stroke meter 71 which detects the length of the cylinder 50 shown in FIG 7 and which is attached to the cylinder 50
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