To optimize the protection provided, the guard forms a flat shield covering the exterior side of the nozzles wherein the shield has an array of passages big enough to allow the ejection of ink droplets but small enough to prevent {HEAD ~ inadvertent contact} or the ingress of {TAIL ~ most dust particles} 
To optimize the protection provided , the guard forms a flat shield covering the exterior side of the nozzles wherein the shield has an array of passages big enough to allow the ejection of ink droplets but small enough to prevent { HEAD ~ inadvertent contact } or the ingress of { TAIL ~ most dust particles }
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