Mounted within the housing are various components of the draft sensing apparatus, {TAIL ~ these components} including a first support 48 in {HEAD ~ the form} of a shaft, a second support indicated generally at 50, the second support being pivotally mounted on the first support 48 
Mounted within the housing are various components of the draft sensing apparatus , { TAIL ~ these components } including a first support 48 in { HEAD ~ the form } of a shaft , a second support indicated generally at 50 , the second support being pivotally mounted on the first support 48
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