GOLDEN NAVITAR ZOOM LENS for 35mm SLIDE PROJECTOR 6"-9" (150-228.6mm) GNZ 6935 | eBay
D. O. Industries Golden Navitar 6" - 9" zoom lens for Kodak slide projector (pair) — Big "D" Broadcast Exchange
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Navitar Zoom 7000 18-108 mm with manual zoom, focus and iris by... - Mengel Engineering
Zoom objective lens - Zoom 6000® series - Navitar - for micro-imaging applications / motorized