| http://www.w3.org/ns/prov#value | - code scannerUS5212370Nov 20, 1990May 18, 1993Ncr CorporationApparatus and method for extending laser life by discontinuous operationUS5216231Aug 8, 1991Jun 1, 1993Alps Electric Co., Ltd.Self-scanning code reading deviceUS5237161Jun 5, 1991Aug 17, 1993Psc, Inc.System for automatically reading symbols, such as bar codes, on objects which are placed in the detection zone of a symbol reading unit, su
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