manufacturing the first CR-39 eyeglass lenses in 1947. CR-39 plastic has an index of refraction of 1.498 and an Abbe number of 58. CR-39 is now a trade-marked...

Thinner, sometimes lighter lenses (See below). Improved UV protection over CR-39 and glass lenses. Lower Abbe number, meaning, amongst other things, increased...

interchanges with CR 38 (North Sea Road) and CR 39 (County Road), CR 79 (Bridgehampton–Sag Harbor Road), NY 114 (East Hampton–Sag Harbor Turnpike), CR 40 (Three...

following 500-series county routes serve Bergen County: CR 501, CR 502, CR 503, CR 504, CR 505, CR 507 Bergen County has one of the longest-lasting county...

the road enters areas of heavy industry and comes to the County Route 602 (CR 602) exit in Carteret. In Union County, I-95 comes to the I-278 exit on the...

Brazilian Portuguese). Retrieved March 14, 2019. "Rio de la Plata trip of CR Flamengo (Rio de Janeiro) 1933". Rec.Sport.Soccer Statistics Foundation. Retrieved...

Polaroid filter. In 1947, the Armorlite Company began producing lenses with CR-39 resin. At present, Xiamen, China is the world's largest producer of sunglasses...

used to produce the lenses: Although relatively durable inside of frames, CR-39 lacks impact resistance and cannot absorb the wear and tear of constant...

called the first scientific report of highly energetic neutrons, using CR-39 plastic radiation detectors, but the claims cannot be validated without...

Road 39A" for the street name, it commonly known as part of CR 39. The entire route is signed as CR 39. Major intersections County Route 39B is Canal Road East...