| http://www.w3.org/ns/prov#value | - orporationDevice for converting hand-held scanner to hands-free scannerUS5198650 *24 Jun 199130 Mar 1993Ncr CorporationHands free/hand held bar code scannerUS5214270 *22 Nov 199125 May 1993Spectra-PhysicsModular handheld or fixed scannerUS5260554 *31 Oct 19919 Nov 1993Psc, Inc.System for automatically reading symbols, such as bar codes, on objects which are placed in the detection zone of a symbol
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