{"product_id":"kopp-glass-lenses-2-in-a-6-3-4-3-3-4","title":"Kopp Glass lenses 2 in a 6 3\/4 3 3\/4","description":"\u003cp\u003eKopp Glass lenses 2 in a 6 3\/4 3 3\/4 \u003c\/p\u003e\u003cp\u003eCompany Name: The words \"Kopp Glass\" are frequently embossed along the outer edge.Part Numbers: Look for codes such as TL (Traffic Lens) followed by a 4-digit number, like TL-4666.Optical Specs: Markings often include the diameter and focal distance, such as 6 3\/4 D followed by a focus measurement (e.g., 3.125 F).A.A.R. Testing: Some vintage railroad-specific lenses will be marked \"A.A.R. Tested,\" indicating they met the American Association of Railroads' strict safety standards.Common Applications for 6 3\/4\" LensesTraffic Signals: Before 8-inch and 12-inch lenses became standard, these 6 3\/4\" and 6 3\/8\" lenses were used in early traffic light units.Aviation\/Airfield Lighting: Kopp's aviation-grade glass is used for approach and beacon lighting.Marine \u0026amp; Industrial Signals: These heavy-duty Fresnel lenses were common on large nautical signals and tall industrial \"danger\" beacons.\u003c\/p\u003e\u003cp\u003eselling as pictured.\u003c\/p\u003e\u003cp\u003emore than welcome to pick up at shop in butler pa \u0026amp; save shipping.\u003c\/p\u003e","brand":"cyclewarehouse.online","offers":[{"title":"Default Title","offer_id":47230678302882,"sku":"kopp634 43026KT","price":124.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0335\/9824\/2861\/files\/image1-78.jpg?v=1777584220","url":"https:\/\/cyclewarehouse.online\/products\/kopp-glass-lenses-2-in-a-6-3-4-3-3-4","provider":"cyclewarehouse.online","version":"1.0","type":"link"}