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<http://webisa.webdatacommons.org/402440802>	<http://www.w3.org/ns/prov#value>	"Once the protective corneal applanator device 102 is in place, the surgeon or other physician releases the plunger 306 of the vacuum syringe 302 to produce a pressure differential that provides partial suction to hold the protective corneal applanator device 102 onto the patient's cornea 204." .