As shown in FIG 1, the housing is fitted closely around the units, {HEAD ~ the amount} of {TAIL ~ clearance} being substantially that which is regarded as conventional, namely sufficient to permit rocking and vibration of the units on their spring mountings without danger of striking the housing 
of
As shown in FIG 1 , the housing is fitted closely around the units , { HEAD ~ the amount } of { TAIL ~ clearance } being substantially that which is regarded as conventional , namely sufficient to permit rocking and vibration of the units on their spring mountings without danger of striking the housing
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