| http://www.w3.org/ns/prov#value | - In U.S. Pat. No. 4,533,569, Aug. 6, 1985, of Bangs for PROCESS PREVENTING AIR BUBBLE LOCK IN INK JET NOZZLES, the interior surface area of a glass nozzle is cleaned with hydrofluoric acid and then coated with a blocking agent such as ethylene glycol, glycerine and the like.
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