The layer of high friction resilient material is preferably constructed and arranged for providing a braking surface to prevent vertical movement of the window sash when the sash is tilted away from the vertical axis of the jamb liner and {HEAD ~ the high friction resilient material} is contacted by {TAIL ~ the locking} means 
is contacted by
The layer of high friction resilient material is preferably constructed and arranged for providing a braking surface to prevent vertical movement of the window sash when the sash is tilted away from the vertical axis of the jamb liner and { HEAD ~ the high friction resilient material } is contacted by { TAIL ~ the locking } means
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