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Beckman Instruments GmbH <1953- 1998>
Beckman Instruments Inc. <1950- 1998>
Optica Sas di Ing. H. Bürkert & Co, <notizie 1968>
Perkin-Elmer <1937->
Varian Associates <1948- 1999>
Franz Schmidt & Haensch <1864->
Perkin Elmer Ltd <notizie seconda metà sec. XX>
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